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    /or1k/trunk/linux/uClibc/libc/misc/wordexp
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Rev 1325 → Rev 1765

/wordexp.c
0,0 → 1,2244
/* vi: set sw=4 ts=4: */
/* POSIX.2 wordexp implementation.
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
 
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
 
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
 
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
 
#define _GNU_SOURCE
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <errno.h>
#include <assert.h>
#include <fnmatch.h>
#include <glob.h>
#include <wordexp.h>
 
#define __WORDEXP_FULL
//#undef __WORDEXP_FULL
 
/*
* This is a recursive-descent-style word expansion routine.
*/
 
/* These variables are defined and initialized in the startup code. */
//extern int __libc_argc;
//extern char **__libc_argv;
 
/* FIXME!!!! */
int __libc_argc;
char **__libc_argv;
 
/* Some forward declarations */
static int parse_dollars(char **word, size_t * word_length,
size_t * max_length, const char *words,
size_t * offset, int flags, wordexp_t * pwordexp,
const char *ifs, const char *ifs_white,
int quoted);
static int parse_backtick(char **word, size_t * word_length,
size_t * max_length, const char *words,
size_t * offset, int flags, wordexp_t * pwordexp,
const char *ifs, const char *ifs_white);
static int parse_dquote(char **word, size_t * word_length,
size_t * max_length, const char *words,
size_t * offset, int flags, wordexp_t * pwordexp,
const char *ifs, const char *ifs_white);
 
 
 
/* The w_*() functions manipulate word lists. */
#define W_CHUNK (100)
 
/* Result of w_newword will be ignored if it's the last word. */
static inline char *w_newword(size_t * actlen, size_t * maxlen)
{
*actlen = *maxlen = 0;
return NULL;
}
 
/* Add a character to the buffer, allocating room for it if needed. */
static inline char *w_addchar(char *buffer, size_t * actlen,
size_t * maxlen, char ch)
/* (lengths exclude trailing zero) */
{
 
if (*actlen == *maxlen) {
char *old_buffer = buffer;
assert(buffer == NULL || *maxlen != 0);
*maxlen += W_CHUNK;
buffer = realloc(buffer, 1 + *maxlen);
if (buffer == NULL)
free(old_buffer);
}
 
if (buffer != NULL) {
buffer[*actlen] = ch;
buffer[++(*actlen)] = '\0';
}
 
return buffer;
}
 
#define MAX( a, b ) ( ( ( a ) > ( b ) ) ? ( a ) : ( b ) )
static char *w_addmem(char *buffer, size_t * actlen, size_t * maxlen,
const char *str, size_t len)
{
/* Add a string to the buffer, allocating room for it if needed.
*/
if (*actlen + len > *maxlen) {
char *old_buffer = buffer;
assert(buffer == NULL || *maxlen != 0);
*maxlen += MAX(2 * len, W_CHUNK);
buffer = realloc(old_buffer, 1 + *maxlen);
if (buffer == NULL)
free(old_buffer);
}
 
if (buffer != NULL) {
*((char *) mempcpy(&buffer[*actlen], str, len)) = '\0';
*actlen += len;
}
return buffer;
}
 
/* Add a string to the buffer, allocating room for it if needed. */
static char *w_addstr(char *buffer, size_t * actlen, size_t * maxlen,
const char *str)
/* (lengths exclude trailing zero) */
{
size_t len;
assert(str != NULL); /* w_addstr only called from this file */
len = strlen(str);
 
return w_addmem(buffer, actlen, maxlen, str, len);
}
 
/* Add a word to the wordlist */
static int w_addword(wordexp_t * pwordexp, char *word)
{
size_t num_p;
char **new_wordv;
 
/* Internally, NULL acts like "". Convert NULLs to "" before
* the caller sees them.
*/
if (word == NULL) {
word = strdup("");
if (word == NULL)
goto no_space;
}
 
num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
new_wordv = realloc(pwordexp->we_wordv, sizeof(char *) * num_p);
if (new_wordv != NULL) {
pwordexp->we_wordv = new_wordv;
pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
return 0;
}
 
no_space:
return WRDE_NOSPACE;
}
 
/* The parse_*() functions should leave *offset being the offset in 'words'
* to the last character processed.
*/
static int
parse_backslash(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset)
{
/* We are poised _at_ a backslash, not in quotes */
 
switch (words[1 + *offset]) {
case 0:
/* Backslash is last character of input words */
return WRDE_SYNTAX;
 
case '\n':
++(*offset);
break;
 
default:
*word = w_addchar(*word, word_length, max_length, words[1 + *offset]);
if (*word == NULL)
return WRDE_NOSPACE;
 
++(*offset);
break;
}
 
return 0;
}
 
static int
parse_qtd_backslash(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset)
{
/* We are poised _at_ a backslash, inside quotes */
 
switch (words[1 + *offset]) {
case 0:
/* Backslash is last character of input words */
return WRDE_SYNTAX;
 
case '\n':
++(*offset);
break;
 
case '$':
case '`':
case '"':
case '\\':
*word =
w_addchar(*word, word_length, max_length, words[1 + *offset]);
if (*word == NULL)
return WRDE_NOSPACE;
 
++(*offset);
break;
 
default:
*word = w_addchar(*word, word_length, max_length, words[*offset]);
if (*word != NULL)
*word =
w_addchar(*word, word_length, max_length,
words[1 + *offset]);
 
if (*word == NULL)
return WRDE_NOSPACE;
 
++(*offset);
break;
}
 
return 0;
}
 
static int
parse_tilde(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, size_t wordc)
{
/* We are poised _at_ a tilde */
size_t i;
 
if (*word_length != 0) {
if (!((*word)[*word_length - 1] == '=' && wordc == 0)) {
if (!((*word)[*word_length - 1] == ':'
&& strchr(*word, '=') && wordc == 0)) {
*word = w_addchar(*word, word_length, max_length, '~');
return *word ? 0 : WRDE_NOSPACE;
}
}
}
 
for (i = 1 + *offset; words[i]; i++) {
if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
words[i] == '\t' || words[i] == 0)
break;
 
if (words[i] == '\\') {
*word = w_addchar(*word, word_length, max_length, '~');
return *word ? 0 : WRDE_NOSPACE;
}
}
 
if (i == 1 + *offset) {
/* Tilde appears on its own */
uid_t uid;
struct passwd pwd, *tpwd;
int buflen = 1000;
char *home;
char *buffer;
int result;
 
/* POSIX.2 says ~ expands to $HOME and if HOME is unset the
results are unspecified. We do a lookup on the uid if
HOME is unset. */
 
home = getenv("HOME");
if (home != NULL) {
*word = w_addstr(*word, word_length, max_length, home);
if (*word == NULL)
return WRDE_NOSPACE;
} else {
uid = getuid();
buffer = alloca(buflen);
 
while ((result = getpwuid_r(uid, &pwd, buffer, buflen, &tpwd))
!= 0 && errno == ERANGE)
{
buflen += 1000;
buffer = alloca(buflen);
}
 
if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL) {
*word = w_addstr(*word, word_length, max_length, pwd.pw_dir);
if (*word == NULL)
return WRDE_NOSPACE;
} else {
*word = w_addchar(*word, word_length, max_length, '~');
if (*word == NULL)
return WRDE_NOSPACE;
}
}
} else {
/* Look up user name in database to get home directory */
char *user = strndup(&words[1 + *offset], i - (1 + *offset));
struct passwd pwd, *tpwd;
int buflen = 1000;
char *buffer = alloca(buflen);
int result;
 
while ((result = getpwnam_r(user, &pwd, buffer, buflen, &tpwd)) != 0
&& errno == ERANGE) {
buflen += 1000;
buffer = alloca(buflen);
}
 
if (result == 0 && tpwd != NULL && pwd.pw_dir)
*word = w_addstr(*word, word_length, max_length, pwd.pw_dir);
else {
/* (invalid login name) */
*word = w_addchar(*word, word_length, max_length, '~');
if (*word != NULL)
*word = w_addstr(*word, word_length, max_length, user);
}
 
*offset = i - 1;
}
return *word ? 0 : WRDE_NOSPACE;
}
 
 
static int
do_parse_glob(const char *glob_word, char **word, size_t * word_length,
size_t * max_length, wordexp_t * pwordexp, const char *ifs,
const char *ifs_white)
{
int error;
int match;
glob_t globbuf;
 
error = glob(glob_word, GLOB_NOCHECK, NULL, &globbuf);
 
if (error != 0) {
/* We can only run into memory problems. */
assert(error == GLOB_NOSPACE);
return WRDE_NOSPACE;
}
 
if (ifs && !*ifs) {
/* No field splitting allowed. */
assert(globbuf.gl_pathv[0] != NULL);
*word = w_addstr(*word, word_length, max_length, globbuf.gl_pathv[0]);
for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match) {
*word = w_addchar(*word, word_length, max_length, ' ');
if (*word != NULL)
*word = w_addstr(*word, word_length, max_length,
globbuf.gl_pathv[match]);
}
 
globfree(&globbuf);
return *word ? 0 : WRDE_NOSPACE;
}
 
assert(ifs == NULL || *ifs != '\0');
if (*word != NULL) {
free(*word);
*word = w_newword(word_length, max_length);
}
 
for (match = 0; match < globbuf.gl_pathc; ++match) {
char *matching_word = strdup(globbuf.gl_pathv[match]);
 
if (matching_word == NULL || w_addword(pwordexp, matching_word)) {
globfree(&globbuf);
return WRDE_NOSPACE;
}
}
 
globfree(&globbuf);
return 0;
}
 
static int
parse_glob(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs, const char *ifs_white)
{
/* We are poised just after a '*', a '[' or a '?'. */
int error = WRDE_NOSPACE;
int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
int i;
wordexp_t glob_list; /* List of words to glob */
 
glob_list.we_wordc = 0;
glob_list.we_wordv = NULL;
glob_list.we_offs = 0;
for (; words[*offset] != '\0'; ++*offset) {
if ((ifs && strchr(ifs, words[*offset])) ||
(!ifs && strchr(" \t\n", words[*offset])))
/* Reached IFS */
break;
 
/* Sort out quoting */
if (words[*offset] == '\'') {
if (quoted == 0) {
quoted = 1;
continue;
} else if (quoted == 1) {
quoted = 0;
continue;
}
} else if (words[*offset] == '"') {
if (quoted == 0) {
quoted = 2;
continue;
} else if (quoted == 2) {
quoted = 0;
continue;
}
}
 
/* Sort out other special characters */
if (quoted != 1 && words[*offset] == '$') {
error = parse_dollars(word, word_length, max_length, words,
offset, flags, &glob_list, ifs,
ifs_white, quoted == 2);
if (error)
goto tidy_up;
 
continue;
} else if (words[*offset] == '\\') {
if (quoted)
error = parse_qtd_backslash(word, word_length, max_length,
words, offset);
else
error = parse_backslash(word, word_length, max_length,
words, offset);
 
if (error)
goto tidy_up;
 
continue;
}
 
*word = w_addchar(*word, word_length, max_length, words[*offset]);
if (*word == NULL)
goto tidy_up;
}
 
/* Don't forget to re-parse the character we stopped at. */
--*offset;
 
/* Glob the words */
error = w_addword(&glob_list, *word);
*word = w_newword(word_length, max_length);
for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
error = do_parse_glob(glob_list.we_wordv[i], word, word_length,
max_length, pwordexp, ifs, ifs_white);
 
/* Now tidy up */
tidy_up:
wordfree(&glob_list);
return error;
}
 
static int
parse_squote(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset)
{
/* We are poised just after a single quote */
for (; words[*offset]; ++(*offset)) {
if (words[*offset] != '\'') {
*word = w_addchar(*word, word_length, max_length, words[*offset]);
if (*word == NULL)
return WRDE_NOSPACE;
} else
return 0;
}
 
/* Unterminated string */
return WRDE_SYNTAX;
}
 
#ifdef __WORDEXP_FULL
static int eval_expr(char *expr, long int *result);
 
static char *_itoa(unsigned long long int value, char *buflim)
{
sprintf(buflim, "%llu", value);
return buflim;
}
 
/* Functions to evaluate an arithmetic expression */
static int eval_expr_val(char **expr, long int *result)
{
int sgn = +1;
char *digit;
 
/* Skip white space */
for (digit = *expr; digit && *digit && isspace(*digit); ++digit);
 
switch (*digit) {
case '(':
 
/* Scan for closing paren */
for (++digit; **expr && **expr != ')'; ++(*expr));
 
/* Is there one? */
if (!**expr)
return WRDE_SYNTAX;
 
*(*expr)++ = 0;
 
if (eval_expr(digit, result))
return WRDE_SYNTAX;
 
return 0;
 
case '+': /* Positive value */
++digit;
break;
 
case '-': /* Negative value */
++digit;
sgn = -1;
break;
 
default:
if (!isdigit(*digit))
return WRDE_SYNTAX;
}
 
*result = 0;
for (; *digit && isdigit(*digit); ++digit)
*result = (*result * 10) + (*digit - '0');
 
*expr = digit;
*result *= sgn;
return 0;
}
 
static int eval_expr_multdiv(char **expr, long int *result)
{
long int arg;
 
/* Read a Value */
if (eval_expr_val(expr, result) != 0)
return WRDE_SYNTAX;
 
while (**expr) {
/* Skip white space */
for (; *expr && **expr && isspace(**expr); ++(*expr));
 
if (**expr == '*') {
++(*expr);
if (eval_expr_val(expr, &arg) != 0)
return WRDE_SYNTAX;
 
*result *= arg;
} else if (**expr == '/') {
++(*expr);
if (eval_expr_val(expr, &arg) != 0)
return WRDE_SYNTAX;
 
*result /= arg;
} else
break;
}
 
return 0;
}
 
static int eval_expr(char *expr, long int *result)
{
long int arg;
 
/* Read a Multdiv */
if (eval_expr_multdiv(&expr, result) != 0)
return WRDE_SYNTAX;
 
while (*expr) {
/* Skip white space */
for (; expr && *expr && isspace(*expr); ++expr);
 
if (*expr == '+') {
++expr;
if (eval_expr_multdiv(&expr, &arg) != 0)
return WRDE_SYNTAX;
 
*result += arg;
} else if (*expr == '-') {
++expr;
if (eval_expr_multdiv(&expr, &arg) != 0)
return WRDE_SYNTAX;
 
*result -= arg;
} else
break;
}
 
return 0;
}
 
static int
parse_arith(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags, int bracket)
{
/* We are poised just after "$((" or "$[" */
int error;
int paren_depth = 1;
size_t expr_length;
size_t expr_maxlen;
char *expr;
 
expr = w_newword(&expr_length, &expr_maxlen);
for (; words[*offset]; ++(*offset)) {
switch (words[*offset]) {
case '$':
error = parse_dollars(&expr, &expr_length, &expr_maxlen,
words, offset, flags, NULL, NULL, NULL,
1);
/* The ``1'' here is to tell parse_dollars not to
* split the fields.
*/
if (error) {
free(expr);
return error;
}
break;
 
case '`':
(*offset)++;
error = parse_backtick(&expr, &expr_length, &expr_maxlen,
words, offset, flags, NULL, NULL, NULL);
/* The first NULL here is to tell parse_backtick not to
* split the fields.
*/
if (error) {
free(expr);
return error;
}
break;
 
case '\\':
error = parse_qtd_backslash(&expr, &expr_length, &expr_maxlen,
words, offset);
if (error) {
free(expr);
return error;
}
/* I think that a backslash within an
* arithmetic expansion is bound to
* cause an error sooner or later anyway though.
*/
break;
 
case ')':
if (--paren_depth == 0) {
char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
long int numresult = 0;
long long int convertme;
 
if (bracket || words[1 + *offset] != ')') {
free(expr);
return WRDE_SYNTAX;
}
 
++(*offset);
 
/* Go - evaluate. */
if (*expr && eval_expr(expr, &numresult) != 0) {
free(expr);
return WRDE_SYNTAX;
}
 
if (numresult < 0) {
convertme = -numresult;
*word = w_addchar(*word, word_length, max_length, '-');
if (!*word) {
free(expr);
return WRDE_NOSPACE;
}
} else
convertme = numresult;
 
result[20] = '\0';
*word = w_addstr(*word, word_length, max_length,
_itoa(convertme, &result[20]));
free(expr);
return *word ? 0 : WRDE_NOSPACE;
}
expr =
w_addchar(expr, &expr_length, &expr_maxlen,
words[*offset]);
if (expr == NULL)
return WRDE_NOSPACE;
 
break;
 
case ']':
if (bracket && paren_depth == 1) {
char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
long int numresult = 0;
 
/* Go - evaluate. */
if (*expr && eval_expr(expr, &numresult) != 0) {
free(expr);
return WRDE_SYNTAX;
}
 
result[20] = '\0';
*word = w_addstr(*word, word_length, max_length,
_itoa(numresult, &result[20]));
free(expr);
return *word ? 0 : WRDE_NOSPACE;
}
 
free(expr);
return WRDE_SYNTAX;
 
case '\n':
case ';':
case '{':
case '}':
free(expr);
return WRDE_BADCHAR;
 
case '(':
++paren_depth;
default:
expr =
w_addchar(expr, &expr_length, &expr_maxlen,
words[*offset]);
if (expr == NULL)
return WRDE_NOSPACE;
}
}
 
/* Premature end */
free(expr);
return WRDE_SYNTAX;
}
 
/* Function called by child process in exec_comm() */
static void
exec_comm_child(char *comm, int *fildes, int showerr, int noexec)
{
const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };
 
/* Execute the command, or just check syntax? */
if (noexec)
args[1] = "-nc";
 
/* Redirect output. */
dup2(fildes[1], 1);
close(fildes[1]);
 
/* Redirect stderr to /dev/null if we have to. */
if (showerr == 0) {
int fd;
 
close(2);
fd = open(_PATH_DEVNULL, O_WRONLY);
if (fd >= 0 && fd != 2) {
dup2(fd, 2);
close(fd);
}
}
 
/* Make sure the subshell doesn't field-split on our behalf. */
unsetenv("IFS");
 
close(fildes[0]);
execve(_PATH_BSHELL, (char *const *) args, __environ);
 
/* Bad. What now? */
abort();
}
 
/* Function to execute a command and retrieve the results */
/* pwordexp contains NULL if field-splitting is forbidden */
static int
exec_comm(char *comm, char **word, size_t * word_length,
size_t * max_length, int flags, wordexp_t * pwordexp,
const char *ifs, const char *ifs_white)
{
int fildes[2];
int bufsize = 128;
int buflen;
int i;
int status = 0;
size_t maxnewlines = 0;
char *buffer;
pid_t pid;
 
/* Don't fork() unless necessary */
if (!comm || !*comm)
return 0;
 
if (pipe(fildes))
/* Bad */
return WRDE_NOSPACE;
 
if ((pid = fork()) < 0) {
/* Bad */
close(fildes[0]);
close(fildes[1]);
return WRDE_NOSPACE;
}
 
if (pid == 0)
exec_comm_child(comm, fildes, (flags & WRDE_SHOWERR), 0);
 
/* Parent */
 
close(fildes[1]);
buffer = alloca(bufsize);
 
if (!pwordexp)
/* Quoted - no field splitting */
{
while (1) {
if ((buflen = read(fildes[0], buffer, bufsize)) < 1) {
if (waitpid(pid, &status, WNOHANG) == 0)
continue;
if ((buflen = read(fildes[0], buffer, bufsize)) < 1)
break;
}
 
maxnewlines += buflen;
 
*word = w_addmem(*word, word_length, max_length, buffer, buflen);
if (*word == NULL)
goto no_space;
}
} else
/* Not quoted - split fields */
{
int copying = 0;
 
/* 'copying' is:
* 0 when searching for first character in a field not IFS white space
* 1 when copying the text of a field
* 2 when searching for possible non-whitespace IFS
* 3 when searching for non-newline after copying field
*/
 
while (1) {
if ((buflen = read(fildes[0], buffer, bufsize)) < 1) {
if (waitpid(pid, &status, WNOHANG) == 0)
continue;
if ((buflen = read(fildes[0], buffer, bufsize)) < 1)
break;
}
 
for (i = 0; i < buflen; ++i) {
if (strchr(ifs, buffer[i]) != NULL) {
/* Current character is IFS */
if (strchr(ifs_white, buffer[i]) == NULL) {
/* Current character is IFS but not whitespace */
if (copying == 2) {
/* current character
* |
* V
* eg: text<space><comma><space>moretext
*
* So, strip whitespace IFS (like at the start)
*/
copying = 0;
continue;
}
 
copying = 0;
/* fall through and delimit field.. */
} else {
if (buffer[i] == '\n') {
/* Current character is (IFS) newline */
 
/* If copying a field, this is the end of it,
but maybe all that's left is trailing newlines.
So start searching for a non-newline. */
if (copying == 1)
copying = 3;
 
continue;
} else {
/* Current character is IFS white space, but
not a newline */
 
/* If not either copying a field or searching
for non-newline after a field, ignore it */
if (copying != 1 && copying != 3)
continue;
 
/* End of field (search for non-ws IFS afterwards) */
copying = 2;
}
}
 
/* First IFS white space (non-newline), or IFS non-whitespace.
* Delimit the field. Nulls are converted by w_addword. */
if (w_addword(pwordexp, *word) == WRDE_NOSPACE)
goto no_space;
 
*word = w_newword(word_length, max_length);
 
maxnewlines = 0;
/* fall back round the loop.. */
} else {
/* Not IFS character */
 
if (copying == 3) {
/* Nothing but (IFS) newlines since the last field,
so delimit it here before starting new word */
if (w_addword(pwordexp, *word) == WRDE_NOSPACE)
goto no_space;
 
*word = w_newword(word_length, max_length);
}
 
copying = 1;
 
if (buffer[i] == '\n') /* happens if newline not in IFS */
maxnewlines++;
else
maxnewlines = 0;
 
*word = w_addchar(*word, word_length, max_length,
buffer[i]);
if (*word == NULL)
goto no_space;
}
}
}
}
 
/* Chop off trailing newlines (required by POSIX.2) */
/* Ensure we don't go back further than the beginning of the
substitution (i.e. remove maxnewlines bytes at most) */
while (maxnewlines-- != 0 &&
*word_length > 0 && (*word)[*word_length - 1] == '\n') {
(*word)[--*word_length] = '\0';
 
/* If the last word was entirely newlines, turn it into a new word
* which can be ignored if there's nothing following it. */
if (*word_length == 0) {
free(*word);
*word = w_newword(word_length, max_length);
break;
}
}
 
close(fildes[0]);
 
/* Check for syntax error (re-execute but with "-n" flag) */
if (buflen < 1 && status != 0) {
if ((pid = fork()) < 0) {
/* Bad */
return WRDE_NOSPACE;
}
 
if (pid == 0) {
fildes[0] = fildes[1] = -1;
exec_comm_child(comm, fildes, 0, 1);
}
 
if (waitpid(pid, &status, 0) == pid && status != 0)
return WRDE_SYNTAX;
}
 
return 0;
 
no_space:
kill(pid, SIGKILL);
waitpid(pid, NULL, 0);
close(fildes[0]);
return WRDE_NOSPACE;
}
 
static int
parse_comm(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs, const char *ifs_white)
{
/* We are poised just after "$(" */
int paren_depth = 1;
int error = 0;
int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
size_t comm_length;
size_t comm_maxlen;
char *comm = w_newword(&comm_length, &comm_maxlen);
 
for (; words[*offset]; ++(*offset)) {
switch (words[*offset]) {
case '\'':
if (quoted == 0)
quoted = 1;
else if (quoted == 1)
quoted = 0;
 
break;
 
case '"':
if (quoted == 0)
quoted = 2;
else if (quoted == 2)
quoted = 0;
 
break;
 
case ')':
if (!quoted && --paren_depth == 0) {
/* Go -- give script to the shell */
if (comm) {
error = exec_comm(comm, word, word_length, max_length,
flags, pwordexp, ifs, ifs_white);
free(comm);
}
 
return error;
}
 
/* This is just part of the script */
break;
 
case '(':
if (!quoted)
++paren_depth;
}
 
comm = w_addchar(comm, &comm_length, &comm_maxlen, words[*offset]);
if (comm == NULL)
return WRDE_NOSPACE;
}
 
/* Premature end */
if (comm)
free(comm);
 
return WRDE_SYNTAX;
}
 
static int
parse_backtick(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs,
const char *ifs_white)
{
/* We are poised just after "`" */
int error;
int squoting = 0;
size_t comm_length;
size_t comm_maxlen;
char *comm = w_newword(&comm_length, &comm_maxlen);
 
for (; words[*offset]; ++(*offset)) {
switch (words[*offset]) {
case '`':
/* Go -- give the script to the shell */
error = exec_comm(comm, word, word_length, max_length, flags,
pwordexp, ifs, ifs_white);
free(comm);
return error;
 
case '\\':
if (squoting) {
error = parse_qtd_backslash(&comm, &comm_length, &comm_maxlen,
words, offset);
 
if (error) {
free(comm);
return error;
}
 
break;
}
 
++(*offset);
error = parse_backslash(&comm, &comm_length, &comm_maxlen, words,
offset);
 
if (error) {
free(comm);
return error;
}
 
break;
 
case '\'':
squoting = 1 - squoting;
default:
comm = w_addchar(comm, &comm_length, &comm_maxlen,
words[*offset]);
if (comm == NULL)
return WRDE_NOSPACE;
}
}
 
/* Premature end */
free(comm);
return WRDE_SYNTAX;
}
 
static int
parse_param(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs, const char *ifs_white,
int quoted)
{
/* We are poised just after "$" */
enum action {
ACT_NONE,
ACT_RP_SHORT_LEFT = '#',
ACT_RP_LONG_LEFT = 'L',
ACT_RP_SHORT_RIGHT = '%',
ACT_RP_LONG_RIGHT = 'R',
ACT_NULL_ERROR = '?',
ACT_NULL_SUBST = '-',
ACT_NONNULL_SUBST = '+',
ACT_NULL_ASSIGN = '='
};
size_t env_length;
size_t env_maxlen;
size_t pat_length;
size_t pat_maxlen;
size_t start = *offset;
char *env;
char *pattern;
char *value = NULL;
enum action action = ACT_NONE;
int depth = 0;
int colon_seen = 0;
int seen_hash = 0;
int free_value = 0;
int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
int error;
int special = 0;
char buffer[21];
int brace = words[*offset] == '{';
 
env = w_newword(&env_length, &env_maxlen);
pattern = w_newword(&pat_length, &pat_maxlen);
 
if (brace)
++ * offset;
 
/* First collect the parameter name. */
 
if (words[*offset] == '#') {
seen_hash = 1;
if (!brace)
goto envsubst;
++*offset;
}
 
if (isalpha(words[*offset]) || words[*offset] == '_') {
/* Normal parameter name. */
do {
env = w_addchar(env, &env_length, &env_maxlen, words[*offset]);
if (env == NULL)
goto no_space;
}
while (isalnum(words[++*offset]) || words[*offset] == '_');
} else if (isdigit(words[*offset])) {
/* Numeric parameter name. */
special = 1;
do {
env = w_addchar(env, &env_length, &env_maxlen, words[*offset]);
if (env == NULL)
goto no_space;
if (!brace)
goto envsubst;
}
while (isdigit(words[++*offset]));
} else if (strchr("*@$", words[*offset]) != NULL) {
/* Special parameter. */
special = 1;
env = w_addchar(env, &env_length, &env_maxlen, words[*offset]);
if (env == NULL)
goto no_space;
++*offset;
} else {
if (brace)
goto syntax;
}
 
if (brace) {
/* Check for special action to be applied to the value. */
switch (words[*offset]) {
case '}':
/* Evaluate. */
goto envsubst;
 
case '#':
action = ACT_RP_SHORT_LEFT;
if (words[1 + *offset] == '#') {
++*offset;
action = ACT_RP_LONG_LEFT;
}
break;
 
case '%':
action = ACT_RP_SHORT_RIGHT;
if (words[1 + *offset] == '%') {
++*offset;
action = ACT_RP_LONG_RIGHT;
}
break;
 
case ':':
if (strchr("-=?+", words[1 + *offset]) == NULL)
goto syntax;
 
colon_seen = 1;
action = words[++*offset];
break;
 
case '-':
case '=':
case '?':
case '+':
action = words[*offset];
break;
 
default:
goto syntax;
}
 
/* Now collect the pattern, but don't expand it yet. */
++*offset;
for (; words[*offset]; ++(*offset)) {
switch (words[*offset]) {
case '{':
if (!pattern_is_quoted)
++depth;
break;
 
case '}':
if (!pattern_is_quoted) {
if (depth == 0)
goto envsubst;
--depth;
}
break;
 
case '\\':
if (pattern_is_quoted)
/* Quoted; treat as normal character. */
break;
 
/* Otherwise, it's an escape: next character is literal. */
if (words[++*offset] == '\0')
goto syntax;
 
pattern = w_addchar(pattern, &pat_length, &pat_maxlen, '\\');
if (pattern == NULL)
goto no_space;
 
break;
 
case '\'':
if (pattern_is_quoted == 0)
pattern_is_quoted = 1;
else if (pattern_is_quoted == 1)
pattern_is_quoted = 0;
 
break;
 
case '"':
if (pattern_is_quoted == 0)
pattern_is_quoted = 2;
else if (pattern_is_quoted == 2)
pattern_is_quoted = 0;
 
break;
}
 
pattern = w_addchar(pattern, &pat_length, &pat_maxlen,
words[*offset]);
if (pattern == NULL)
goto no_space;
}
}
 
/* End of input string -- remember to reparse the character that we
* stopped at. */
--(*offset);
 
envsubst:
if (words[start] == '{' && words[*offset] != '}')
goto syntax;
 
if (env == NULL) {
if (seen_hash) {
/* $# expands to the number of positional parameters */
buffer[20] = '\0';
value = _itoa(__libc_argc - 1, &buffer[20]);
seen_hash = 0;
} else {
/* Just $ on its own */
*offset = start - 1;
*word = w_addchar(*word, word_length, max_length, '$');
return *word ? 0 : WRDE_NOSPACE;
}
}
/* Is it a numeric parameter? */
else if (isdigit(env[0])) {
int n = atoi(env);
 
if (n >= __libc_argc)
/* Substitute NULL. */
value = NULL;
else
/* Replace with appropriate positional parameter. */
value = __libc_argv[n];
}
/* Is it a special parameter? */
else if (special) {
/* Is it `$$'? */
if (*env == '$') {
buffer[20] = '\0';
value = _itoa(getpid(), &buffer[20]);
}
/* Is it `${#*}' or `${#@}'? */
else if ((*env == '*' || *env == '@') && seen_hash) {
buffer[20] = '\0';
value = _itoa(__libc_argc > 0 ? __libc_argc - 1 : 0,
&buffer[20]);
*word = w_addstr(*word, word_length, max_length, value);
free(env);
if (pattern)
free(pattern);
return *word ? 0 : WRDE_NOSPACE;
}
/* Is it `$*' or `$@' (unquoted) ? */
else if (*env == '*' || (*env == '@' && !quoted)) {
size_t plist_len = 0;
int p;
char *end;
 
/* Build up value parameter by parameter (copy them) */
for (p = 1; __libc_argv[p]; ++p)
plist_len += strlen(__libc_argv[p]) + 1; /* for space */
value = malloc(plist_len);
if (value == NULL)
goto no_space;
end = value;
*end = 0;
for (p = 1; __libc_argv[p]; ++p) {
if (p > 1)
*end++ = ' ';
end = stpcpy(end, __libc_argv[p]);
}
 
free_value = 1;
} else {
/* Must be a quoted `$@' */
assert(*env == '@' && quoted);
 
/* Each parameter is a separate word ("$@") */
if (__libc_argc == 2)
value = __libc_argv[1];
else if (__libc_argc > 2) {
int p;
 
/* Append first parameter to current word. */
value = w_addstr(*word, word_length, max_length,
__libc_argv[1]);
if (value == NULL || w_addword(pwordexp, value))
goto no_space;
 
for (p = 2; __libc_argv[p + 1]; p++) {
char *newword = strdup(__libc_argv[p]);
 
if (newword == NULL || w_addword(pwordexp, newword))
goto no_space;
}
 
/* Start a new word with the last parameter. */
*word = w_newword(word_length, max_length);
value = __libc_argv[p];
} else {
free(env);
free(pattern);
return 0;
}
}
} else
value = getenv(env);
 
if (value == NULL && (flags & WRDE_UNDEF)) {
/* Variable not defined. */
error = WRDE_BADVAL;
goto do_error;
}
 
if (action != ACT_NONE) {
int expand_pattern = 0;
 
/* First, find out if we need to expand pattern (i.e. if we will
* use it). */
switch (action) {
case ACT_RP_SHORT_LEFT:
case ACT_RP_LONG_LEFT:
case ACT_RP_SHORT_RIGHT:
case ACT_RP_LONG_RIGHT:
/* Always expand for these. */
expand_pattern = 1;
break;
 
case ACT_NULL_ERROR:
case ACT_NULL_SUBST:
case ACT_NULL_ASSIGN:
if (!value || (!*value && colon_seen))
/* If param is unset, or set but null and a colon has been seen,
the expansion of the pattern will be needed. */
expand_pattern = 1;
 
break;
 
case ACT_NONNULL_SUBST:
/* Expansion of word will be needed if parameter is set and not null,
or set null but no colon has been seen. */
if (value && (*value || !colon_seen))
expand_pattern = 1;
 
break;
 
default:
assert(!"Unrecognised action!");
}
 
if (expand_pattern) {
/* We need to perform tilde expansion, parameter expansion,
command substitution, and arithmetic expansion. We also
have to be a bit careful with wildcard characters, as
pattern might be given to fnmatch soon. To do this, we
convert quotes to escapes. */
 
char *expanded;
size_t exp_len;
size_t exp_maxl;
char *p;
int quoted = 0; /* 1: single quotes; 2: double */
 
expanded = w_newword(&exp_len, &exp_maxl);
for (p = pattern; p && *p; p++) {
size_t offset;
 
switch (*p) {
case '"':
if (quoted == 2)
quoted = 0;
else if (quoted == 0)
quoted = 2;
else
break;
 
continue;
 
case '\'':
if (quoted == 1)
quoted = 0;
else if (quoted == 0)
quoted = 1;
else
break;
 
continue;
 
case '*':
case '?':
if (quoted) {
/* Convert quoted wildchar to escaped wildchar. */
expanded = w_addchar(expanded, &exp_len,
&exp_maxl, '\\');
 
if (expanded == NULL)
goto no_space;
}
break;
 
case '$':
offset = 0;
error = parse_dollars(&expanded, &exp_len, &exp_maxl, p,
&offset, flags, NULL, NULL, NULL, 1);
if (error) {
if (free_value)
free(value);
 
if (expanded)
free(expanded);
 
goto do_error;
}
 
p += offset;
continue;
 
case '~':
if (quoted || exp_len)
break;
 
offset = 0;
error = parse_tilde(&expanded, &exp_len, &exp_maxl, p,
&offset, 0);
if (error) {
if (free_value)
free(value);
 
if (expanded)
free(expanded);
 
goto do_error;
}
 
p += offset;
continue;
 
case '\\':
expanded = w_addchar(expanded, &exp_len, &exp_maxl, '\\');
++p;
assert(*p); /* checked when extracted initially */
if (expanded == NULL)
goto no_space;
}
 
expanded = w_addchar(expanded, &exp_len, &exp_maxl, *p);
 
if (expanded == NULL)
goto no_space;
}
 
if (pattern)
free(pattern);
 
pattern = expanded;
}
 
switch (action) {
case ACT_RP_SHORT_LEFT:
case ACT_RP_LONG_LEFT:
case ACT_RP_SHORT_RIGHT:
case ACT_RP_LONG_RIGHT:
{
char *p;
char c;
char *end;
 
if (value == NULL || pattern == NULL || *pattern == '\0')
break;
 
end = value + strlen(value);
 
switch (action) {
case ACT_RP_SHORT_LEFT:
for (p = value; p <= end; ++p) {
c = *p;
*p = '\0';
if (fnmatch(pattern, value, 0) != FNM_NOMATCH) {
*p = c;
if (free_value) {
char *newval = strdup(p);
 
if (newval == NULL) {
free(value);
goto no_space;
}
free(value);
value = newval;
} else
value = p;
break;
}
*p = c;
}
 
break;
 
case ACT_RP_LONG_LEFT:
for (p = end; p >= value; --p) {
c = *p;
*p = '\0';
if (fnmatch(pattern, value, 0) != FNM_NOMATCH) {
*p = c;
if (free_value) {
char *newval = strdup(p);
 
if (newval == NULL) {
free(value);
goto no_space;
}
free(value);
value = newval;
} else
value = p;
break;
}
*p = c;
}
 
break;
 
case ACT_RP_SHORT_RIGHT:
for (p = end; p >= value; --p) {
if (fnmatch(pattern, p, 0) != FNM_NOMATCH) {
char *newval;
 
newval = malloc(p - value + 1);
 
if (newval == NULL) {
if (free_value)
free(value);
goto no_space;
}
 
*(char *) mempcpy(newval, value, p - value) = '\0';
if (free_value)
free(value);
value = newval;
free_value = 1;
break;
}
}
 
break;
 
case ACT_RP_LONG_RIGHT:
for (p = value; p <= end; ++p) {
if (fnmatch(pattern, p, 0) != FNM_NOMATCH) {
char *newval;
 
newval = malloc(p - value + 1);
 
if (newval == NULL) {
if (free_value)
free(value);
goto no_space;
}
 
*(char *) mempcpy(newval, value, p - value) = '\0';
if (free_value)
free(value);
value = newval;
free_value = 1;
break;
}
}
 
break;
 
default:
break;
}
 
break;
}
 
case ACT_NULL_ERROR:
if (value && *value)
/* Substitute parameter */
break;
 
error = 0;
if (!colon_seen && value)
/* Substitute NULL */
;
else if (*pattern)
fprintf(stderr, "%s: %s\n", env, pattern);
else {
fprintf(stderr, "%s: parameter null or not set\n", env);
error = WRDE_BADVAL;
}
 
if (free_value)
free(value);
goto do_error;
 
case ACT_NULL_SUBST:
if (value && *value)
/* Substitute parameter */
break;
 
if (free_value && value)
free(value);
 
if (!colon_seen && value)
/* Substitute NULL */
goto success;
 
value = pattern ? strdup(pattern) : pattern;
free_value = 1;
 
if (pattern && !value)
goto no_space;
 
break;
 
case ACT_NONNULL_SUBST:
if (value && (*value || !colon_seen)) {
if (free_value && value)
free(value);
 
value = pattern ? strdup(pattern) : pattern;
free_value = 1;
 
if (pattern && !value)
goto no_space;
 
break;
}
 
/* Substitute NULL */
if (free_value)
free(value);
goto success;
 
case ACT_NULL_ASSIGN:
if (value && *value)
/* Substitute parameter */
break;
 
if (!colon_seen && value) {
/* Substitute NULL */
if (free_value)
free(value);
goto success;
}
 
if (free_value && value)
free(value);
 
value = pattern ? strdup(pattern) : pattern;
free_value = 1;
 
if (pattern && !value)
goto no_space;
 
setenv(env, value, 1);
break;
 
default:
assert(!"Unrecognised action!");
}
}
 
free(env);
env = NULL;
free(pattern);
pattern = NULL;
 
if (seen_hash) {
char param_length[21];
 
param_length[20] = '\0';
*word = w_addstr(*word, word_length, max_length,
_itoa(value ? strlen(value) : 0,
&param_length[20]));
if (free_value) {
assert(value != NULL);
free(value);
}
 
return *word ? 0 : WRDE_NOSPACE;
}
 
if (value == NULL)
return 0;
 
if (quoted || !pwordexp) {
/* Quoted - no field split */
*word = w_addstr(*word, word_length, max_length, value);
if (free_value)
free(value);
 
return *word ? 0 : WRDE_NOSPACE;
} else {
/* Need to field-split */
char *value_copy = strdup(value); /* Don't modify value */
char *field_begin = value_copy;
int seen_nonws_ifs = 0;
 
if (free_value)
free(value);
 
if (value_copy == NULL)
goto no_space;
 
do {
char *field_end = field_begin;
char *next_field;
 
/* If this isn't the first field, start a new word */
if (field_begin != value_copy) {
if (w_addword(pwordexp, *word) == WRDE_NOSPACE) {
free(value_copy);
goto no_space;
}
 
*word = w_newword(word_length, max_length);
}
 
/* Skip IFS whitespace before the field */
field_begin += strspn(field_begin, ifs_white);
 
if (!seen_nonws_ifs && *field_begin == 0)
/* Nothing but whitespace */
break;
 
/* Search for the end of the field */
field_end = field_begin + strcspn(field_begin, ifs);
 
/* Set up pointer to the character after end of field and
skip whitespace IFS after it. */
next_field = field_end + strspn(field_end, ifs_white);
 
/* Skip at most one non-whitespace IFS character after the field */
seen_nonws_ifs = 0;
if (*next_field && strchr(ifs, *next_field)) {
seen_nonws_ifs = 1;
next_field++;
}
 
/* Null-terminate it */
*field_end = 0;
 
/* Tag a copy onto the current word */
*word = w_addstr(*word, word_length, max_length, field_begin);
 
if (*word == NULL && *field_begin != '\0') {
free(value_copy);
goto no_space;
}
 
field_begin = next_field;
}
while (seen_nonws_ifs || *field_begin);
 
free(value_copy);
}
 
return 0;
 
success:
error = 0;
goto do_error;
 
no_space:
error = WRDE_NOSPACE;
goto do_error;
 
syntax:
error = WRDE_SYNTAX;
 
do_error:
if (env)
free(env);
 
if (pattern)
free(pattern);
 
return error;
}
#else
static inline int
parse_backtick(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs,
const char *ifs_white)
{
return 0;
}
#endif
 
static int
parse_dollars(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs, const char *ifs_white,
int quoted)
{
/* We are poised _at_ "$" */
switch (words[1 + *offset]) {
case '"':
case '\'':
case 0:
*word = w_addchar(*word, word_length, max_length, '$');
return *word ? 0 : WRDE_NOSPACE;
 
#ifdef __WORDEXP_FULL
case '(':
if (words[2 + *offset] == '(') {
/* Differentiate between $((1+3)) and $((echo);(ls)) */
int i = 3 + *offset;
int depth = 0;
 
while (words[i] && !(depth == 0 && words[i] == ')')) {
if (words[i] == '(')
++depth;
else if (words[i] == ')')
--depth;
 
++i;
}
 
if (words[i] == ')' && words[i + 1] == ')') {
(*offset) += 3;
/* Call parse_arith -- 0 is for "no brackets" */
return parse_arith(word, word_length, max_length, words,
offset, flags, 0);
}
}
 
if (flags & WRDE_NOCMD)
return WRDE_CMDSUB;
 
(*offset) += 2;
return parse_comm(word, word_length, max_length, words, offset,
flags, quoted ? NULL : pwordexp, ifs, ifs_white);
 
case '[':
(*offset) += 2;
/* Call parse_arith -- 1 is for "brackets" */
return parse_arith(word, word_length, max_length, words, offset,
flags, 1);
 
case '{':
default:
++(*offset); /* parse_param needs to know if "{" is there */
return parse_param(word, word_length, max_length, words, offset,
flags, pwordexp, ifs, ifs_white, quoted);
#else
default:
++(*offset); /* parse_param needs to know if "{" is there */
return 0;
#endif
}
}
 
static int
parse_dquote(char **word, size_t * word_length, size_t * max_length,
const char *words, size_t * offset, int flags,
wordexp_t * pwordexp, const char *ifs, const char *ifs_white)
{
/* We are poised just after a double-quote */
int error;
 
for (; words[*offset]; ++(*offset)) {
switch (words[*offset]) {
case '"':
return 0;
 
case '$':
error = parse_dollars(word, word_length, max_length, words, offset,
flags, pwordexp, ifs, ifs_white, 1);
/* The ``1'' here is to tell parse_dollars not to
* split the fields. It may need to, however ("$@").
*/
if (error)
return error;
 
break;
 
case '`':
if (flags & WRDE_NOCMD)
return WRDE_CMDSUB;
 
++(*offset);
error = parse_backtick(word, word_length, max_length, words,
offset, flags, NULL, NULL, NULL);
/* The first NULL here is to tell parse_backtick not to
* split the fields.
*/
if (error)
return error;
 
break;
 
case '\\':
error = parse_qtd_backslash(word, word_length, max_length, words,
offset);
 
if (error)
return error;
 
break;
 
default:
*word = w_addchar(*word, word_length, max_length, words[*offset]);
if (*word == NULL)
return WRDE_NOSPACE;
}
}
 
/* Unterminated string */
return WRDE_SYNTAX;
}
 
/*
* wordfree() is to be called after pwordexp is finished with.
*/
 
void wordfree(wordexp_t * pwordexp)
{
 
/* wordexp can set pwordexp to NULL */
if (pwordexp && pwordexp->we_wordv) {
char **wordv = pwordexp->we_wordv;
 
for (wordv += pwordexp->we_offs; *wordv; ++wordv)
free(*wordv);
 
free(pwordexp->we_wordv);
pwordexp->we_wordv = NULL;
}
}
 
/*
* wordexp()
*/
 
int wordexp(const char *words, wordexp_t * we, int flags)
{
size_t words_offset;
size_t word_length;
size_t max_length;
char *word = w_newword(&word_length, &max_length);
int error;
char *ifs;
char ifs_white[4];
wordexp_t old_word = *we;
 
if (flags & WRDE_REUSE) {
/* Minimal implementation of WRDE_REUSE for now */
wordfree(we);
old_word.we_wordv = NULL;
}
 
if ((flags & WRDE_APPEND) == 0) {
we->we_wordc = 0;
 
if (flags & WRDE_DOOFFS) {
we->we_wordv = calloc(1 + we->we_offs, sizeof(char *));
if (we->we_wordv == NULL) {
error = WRDE_NOSPACE;
goto do_error;
}
} else {
we->we_wordv = calloc(1, sizeof(char *));
if (we->we_wordv == NULL) {
error = WRDE_NOSPACE;
goto do_error;
}
 
we->we_offs = 0;
}
}
 
/* Find out what the field separators are.
* There are two types: whitespace and non-whitespace.
*/
ifs = getenv("IFS");
 
if (!ifs)
/* IFS unset - use <space><tab><newline>. */
ifs = strcpy(ifs_white, " \t\n");
else {
char *ifsch = ifs;
char *whch = ifs_white;
 
/* Start off with no whitespace IFS characters */
ifs_white[0] = '\0';
 
while (*ifsch != '\0') {
if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n')) {
/* Whitespace IFS. See first whether it is already in our
collection. */
char *runp = ifs_white;
 
while (runp < whch && *runp != '\0' && *runp != *ifsch)
++runp;
 
if (runp == whch)
*whch++ = *ifsch;
}
 
++ifsch;
}
*whch = '\0';
}
 
for (words_offset = 0; words[words_offset]; ++words_offset)
switch (words[words_offset]) {
case '\\':
error = parse_backslash(&word, &word_length, &max_length, words,
&words_offset);
 
if (error)
goto do_error;
 
break;
 
case '$':
error = parse_dollars(&word, &word_length, &max_length, words,
&words_offset, flags, we, ifs, ifs_white,
0);
 
if (error)
goto do_error;
 
break;
 
case '`':
if (flags & WRDE_NOCMD) {
error = WRDE_CMDSUB;
goto do_error;
}
 
++words_offset;
error = parse_backtick(&word, &word_length, &max_length, words,
&words_offset, flags, we, ifs,
ifs_white);
 
if (error)
goto do_error;
 
break;
 
case '"':
++words_offset;
error = parse_dquote(&word, &word_length, &max_length, words,
&words_offset, flags, we, ifs, ifs_white);
 
if (error)
goto do_error;
 
if (!word_length) {
error = w_addword(we, NULL);
 
if (error)
return error;
}
 
break;
 
case '\'':
++words_offset;
error = parse_squote(&word, &word_length, &max_length, words,
&words_offset);
 
if (error)
goto do_error;
 
if (!word_length) {
error = w_addword(we, NULL);
 
if (error)
return error;
}
 
break;
 
case '~':
error = parse_tilde(&word, &word_length, &max_length, words,
&words_offset, we->we_wordc);
 
if (error)
goto do_error;
 
break;
 
case '*':
case '[':
case '?':
error = parse_glob(&word, &word_length, &max_length, words,
&words_offset, flags, we, ifs, ifs_white);
 
if (error)
goto do_error;
 
break;
 
default:
/* Is it a word separator? */
if (strchr(" \t", words[words_offset]) == NULL) {
char ch = words[words_offset];
 
/* Not a word separator -- but is it a valid word char? */
if (strchr("\n|&;<>(){}", ch)) {
/* Fail */
error = WRDE_BADCHAR;
goto do_error;
}
 
/* "Ordinary" character -- add it to word */
word = w_addchar(word, &word_length, &max_length, ch);
if (word == NULL) {
error = WRDE_NOSPACE;
goto do_error;
}
 
break;
}
 
/* If a word has been delimited, add it to the list. */
if (word != NULL) {
error = w_addword(we, word);
if (error)
goto do_error;
}
 
word = w_newword(&word_length, &max_length);
}
 
/* End of string */
 
/* There was a word separator at the end */
if (word == NULL) /* i.e. w_newword */
return 0;
 
/* There was no field separator at the end */
return w_addword(we, word);
 
do_error:
/* Error:
* free memory used (unless error is WRDE_NOSPACE), and
* set we members back to what they were.
*/
 
if (word != NULL)
free(word);
 
if (error == WRDE_NOSPACE)
return WRDE_NOSPACE;
 
if ((flags & WRDE_APPEND) == 0)
wordfree(we);
 
*we = old_word;
return error;
}
/Makefile
0,0 → 1,39
# Makefile for uClibc
#
# Copyright (C) 2003 Erik Andersen <andersen@uclibc.org>
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU Library General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
# details.
#
# You should have received a copy of the GNU Library General Public License
# along with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 
TOPDIR=../../../
include $(TOPDIR)Rules.mak
 
CSRC=wordexp.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
OBJS=$(COBJS)
 
all: $(OBJS) $(LIBC)
 
$(LIBC): ar-target
 
ar-target: $(OBJS)
$(AR) $(ARFLAGS) $(LIBC) $(OBJS)
 
$(COBJS): %.o : %.c
$(CC) $(CFLAGS) -c $< -o $@
$(STRIPTOOL) -x -R .note -R .comment $*.o
 
clean:
$(RM) *.[oa] *~ core
 

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