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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgfortran/] [runtime/] [environ.c] - Rev 761
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/* Copyright (C) 2002, 2003, 2005, 2007, 2009 Free Software Foundation, Inc. Contributed by Andy Vaught This file is part of the GNU Fortran 95 runtime library (libgfortran). Libgfortran is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. Libgfortran 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 General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #include "libgfortran.h" #include <string.h> #include <stdlib.h> #include <ctype.h> /* Environment scanner. Examine the environment for controlling minor * aspects of the program's execution. Our philosophy here that the * environment should not prevent the program from running, so an * environment variable with a messed-up value will be interpreted in * the default way. * * Most of the environment is checked early in the startup sequence, * but other variables are checked during execution of the user's * program. */ options_t options; typedef struct variable { const char *name; int value, *var; void (*init) (struct variable *); void (*show) (struct variable *); const char *desc; int bad; } variable; static void init_unformatted (variable *); /* print_spaces()-- Print a particular number of spaces. */ static void print_spaces (int n) { char buffer[80]; int i; if (n <= 0) return; for (i = 0; i < n; i++) buffer[i] = ' '; buffer[i] = '\0'; estr_write (buffer); } /* var_source()-- Return a string that describes where the value of a * variable comes from */ static const char * var_source (variable * v) { if (getenv (v->name) == NULL) return "Default"; if (v->bad) return "Bad "; return "Set "; } /* init_integer()-- Initialize an integer environment variable. */ static void init_integer (variable * v) { char *p, *q; p = getenv (v->name); if (p == NULL) goto set_default; for (q = p; *q; q++) if (!isdigit (*q) && (p != q || *q != '-')) { v->bad = 1; goto set_default; } *v->var = atoi (p); return; set_default: *v->var = v->value; return; } /* init_unsigned_integer()-- Initialize an integer environment variable which has to be positive. */ static void init_unsigned_integer (variable * v) { char *p, *q; p = getenv (v->name); if (p == NULL) goto set_default; for (q = p; *q; q++) if (!isdigit (*q)) { v->bad = 1; goto set_default; } *v->var = atoi (p); return; set_default: *v->var = v->value; return; } /* show_integer()-- Show an integer environment variable */ static void show_integer (variable * v) { st_printf ("%s %d\n", var_source (v), *v->var); } /* init_boolean()-- Initialize a boolean environment variable. We * only look at the first letter of the variable. */ static void init_boolean (variable * v) { char *p; p = getenv (v->name); if (p == NULL) goto set_default; if (*p == '1' || *p == 'Y' || *p == 'y') { *v->var = 1; return; } if (*p == '0' || *p == 'N' || *p == 'n') { *v->var = 0; return; } v->bad = 1; set_default: *v->var = v->value; return; } /* show_boolean()-- Show a boolean environment variable */ static void show_boolean (variable * v) { st_printf ("%s %s\n", var_source (v), *v->var ? "Yes" : "No"); } static void init_sep (variable * v) { int seen_comma; char *p; p = getenv (v->name); if (p == NULL) goto set_default; v->bad = 1; options.separator = p; options.separator_len = strlen (p); /* Make sure the separator is valid */ if (options.separator_len == 0) goto set_default; seen_comma = 0; while (*p) { if (*p == ',') { if (seen_comma) goto set_default; seen_comma = 1; p++; continue; } if (*p++ != ' ') goto set_default; } v->bad = 0; return; set_default: options.separator = " "; options.separator_len = 1; } static void show_sep (variable * v) { st_printf ("%s \"%s\"\n", var_source (v), options.separator); } static void init_string (variable * v __attribute__ ((unused))) { } static void show_string (variable * v) { const char *p; p = getenv (v->name); if (p == NULL) p = ""; estr_write (var_source (v)); estr_write (" \""); estr_write (p); estr_write ("\"\n"); } static variable variable_table[] = { {"GFORTRAN_STDIN_UNIT", GFC_STDIN_UNIT_NUMBER, &options.stdin_unit, init_integer, show_integer, "Unit number that will be preconnected to standard input\n" "(No preconnection if negative)", 0}, {"GFORTRAN_STDOUT_UNIT", GFC_STDOUT_UNIT_NUMBER, &options.stdout_unit, init_integer, show_integer, "Unit number that will be preconnected to standard output\n" "(No preconnection if negative)", 0}, {"GFORTRAN_STDERR_UNIT", GFC_STDERR_UNIT_NUMBER, &options.stderr_unit, init_integer, show_integer, "Unit number that will be preconnected to standard error\n" "(No preconnection if negative)", 0}, {"GFORTRAN_TMPDIR", 0, NULL, init_string, show_string, "Directory for scratch files. Overrides the TMP environment variable\n" "If TMP is not set " DEFAULT_TEMPDIR " is used.", 0}, {"GFORTRAN_UNBUFFERED_ALL", 0, &options.all_unbuffered, init_boolean, show_boolean, "If TRUE, all output is unbuffered. This will slow down large writes " "but can be\nuseful for forcing data to be displayed immediately.", 0}, {"GFORTRAN_UNBUFFERED_PRECONNECTED", 0, &options.unbuffered_preconnected, init_boolean, show_boolean, "If TRUE, output to preconnected units is unbuffered.", 0}, {"GFORTRAN_SHOW_LOCUS", 1, &options.locus, init_boolean, show_boolean, "If TRUE, print filename and line number where runtime errors happen.", 0}, {"GFORTRAN_OPTIONAL_PLUS", 0, &options.optional_plus, init_boolean, show_boolean, "Print optional plus signs in numbers where permitted. Default FALSE.", 0}, {"GFORTRAN_DEFAULT_RECL", DEFAULT_RECL, &options.default_recl, init_unsigned_integer, show_integer, "Default maximum record length for sequential files. Most useful for\n" "adjusting line length of preconnected units. Default " stringize (DEFAULT_RECL), 0}, {"GFORTRAN_LIST_SEPARATOR", 0, NULL, init_sep, show_sep, "Separator to use when writing list output. May contain any number of " "spaces\nand at most one comma. Default is a single space.", 0}, /* GFORTRAN_CONVERT_UNIT - Set the default data conversion for unformatted I/O. */ {"GFORTRAN_CONVERT_UNIT", 0, 0, init_unformatted, show_string, "Set format for unformatted files", 0}, {"GFORTRAN_ERROR_BACKTRACE", -1, &options.backtrace, init_boolean, show_boolean, "Print out a backtrace (if possible) on runtime error", -1}, {NULL, 0, NULL, NULL, NULL, NULL, 0} }; /* init_variables()-- Initialize most runtime variables from * environment variables. */ void init_variables (void) { variable *v; for (v = variable_table; v->name; v++) v->init (v); } void show_variables (void) { variable *v; int n; /* TODO: print version number. */ estr_write ("GNU Fortran runtime library version " "UNKNOWN" "\n\n"); estr_write ("Environment variables:\n"); estr_write ("----------------------\n"); for (v = variable_table; v->name; v++) { n = estr_write (v->name); print_spaces (25 - n); if (v->show == show_integer) estr_write ("Integer "); else if (v->show == show_boolean) estr_write ("Boolean "); else estr_write ("String "); v->show (v); estr_write (v->desc); estr_write ("\n\n"); } /* System error codes */ estr_write ("\nRuntime error codes:"); estr_write ("\n--------------------\n"); for (n = LIBERROR_FIRST + 1; n < LIBERROR_LAST; n++) if (n < 0 || n > 9) st_printf ("%d %s\n", n, translate_error (n)); else st_printf (" %d %s\n", n, translate_error (n)); estr_write ("\nCommand line arguments:\n"); estr_write (" --help Print this list\n"); exit (0); } /* This is the handling of the GFORTRAN_CONVERT_UNITS environment variable. It is called from environ.c to parse this variable, and from open.c to determine if the user specified a default for an unformatted file. The syntax of the environment variable is, in bison grammar: GFORTRAN_CONVERT_UNITS: mode | mode ';' exception ; mode: 'native' | 'swap' | 'big_endian' | 'little_endian' ; exception: mode ':' unit_list | unit_list ; unit_list: unit_spec | unit_list unit_spec ; unit_spec: INTEGER | INTEGER '-' INTEGER ; */ /* Defines for the tokens. Other valid tokens are ',', ':', '-'. */ #define NATIVE 257 #define SWAP 258 #define BIG 259 #define LITTLE 260 /* Some space for additional tokens later. */ #define INTEGER 273 #define END (-1) #define ILLEGAL (-2) typedef struct { int unit; unit_convert conv; } exception_t; static char *p; /* Main character pointer for parsing. */ static char *lastpos; /* Auxiliary pointer, for backing up. */ static int unit_num; /* The last unit number read. */ static int unit_count; /* The number of units found. */ static int do_count; /* Parsing is done twice - first to count the number of units, then to fill in the table. This variable controls what to do. */ static exception_t *elist; /* The list of exceptions to the default. This is sorted according to unit number. */ static int n_elist; /* Number of exceptions to the default. */ static unit_convert endian; /* Current endianness. */ static unit_convert def; /* Default as specified (if any). */ /* Search for a unit number, using a binary search. The first argument is the unit number to search for. The second argument is a pointer to an index. If the unit number is found, the function returns 1, and the index is that of the element. If the unit number is not found, the function returns 0, and the index is the one where the element would be inserted. */ static int search_unit (int unit, int *ip) { int low, high, mid; low = -1; high = n_elist; while (high - low > 1) { mid = (low + high) / 2; if (unit <= elist[mid].unit) high = mid; else low = mid; } *ip = high; if (elist[high].unit == unit) return 1; else return 0; } /* This matches a keyword. If it is found, return the token supplied, otherwise return ILLEGAL. */ static int match_word (const char *word, int tok) { int res; if (strncasecmp (p, word, strlen (word)) == 0) { p += strlen (word); res = tok; } else res = ILLEGAL; return res; } /* Match an integer and store its value in unit_num. This only works if p actually points to the start of an integer. The caller has to ensure this. */ static int match_integer (void) { unit_num = 0; while (isdigit (*p)) unit_num = unit_num * 10 + (*p++ - '0'); return INTEGER; } /* This reads the next token from the GFORTRAN_CONVERT_UNITS variable. Returned values are the different tokens. */ static int next_token (void) { int result; lastpos = p; switch (*p) { case '\0': result = END; break; case ':': case ',': case '-': case ';': result = *p; p++; break; case 'b': case 'B': result = match_word ("big_endian", BIG); break; case 'l': case 'L': result = match_word ("little_endian", LITTLE); break; case 'n': case 'N': result = match_word ("native", NATIVE); break; case 's': case 'S': result = match_word ("swap", SWAP); break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': result = match_integer (); break; default: result = ILLEGAL; break; } return result; } /* Back up the last token by setting back the character pointer. */ static void push_token (void) { p = lastpos; } /* This is called when a unit is identified. If do_count is nonzero, increment the number of units by one. If do_count is zero, put the unit into the table. */ static void mark_single (int unit) { int i,j; if (do_count) { unit_count++; return; } if (search_unit (unit, &i)) { elist[unit].conv = endian; } else { for (j=n_elist; j>=i; j--) elist[j+1] = elist[j]; n_elist += 1; elist[i].unit = unit; elist[i].conv = endian; } } /* This is called when a unit range is identified. If do_count is nonzero, increase the number of units. If do_count is zero, put the unit into the table. */ static void mark_range (int unit1, int unit2) { int i; if (do_count) unit_count += abs (unit2 - unit1) + 1; else { if (unit2 < unit1) for (i=unit2; i<=unit1; i++) mark_single (i); else for (i=unit1; i<=unit2; i++) mark_single (i); } } /* Parse the GFORTRAN_CONVERT_UNITS variable. This is called twice, once to count the units and once to actually mark them in the table. When counting, we don't check for double occurrences of units. */ static int do_parse (void) { int tok; int unit1; int continue_ulist; char *start; unit_count = 0; start = p; /* Parse the string. First, let's look for a default. */ tok = next_token (); switch (tok) { case NATIVE: endian = GFC_CONVERT_NATIVE; break; case SWAP: endian = GFC_CONVERT_SWAP; break; case BIG: endian = GFC_CONVERT_BIG; break; case LITTLE: endian = GFC_CONVERT_LITTLE; break; case INTEGER: /* A leading digit means that we are looking at an exception. Reset the position to the beginning, and continue processing at the exception list. */ p = start; goto exceptions; break; case END: goto end; break; default: goto error; break; } tok = next_token (); switch (tok) { case ';': def = endian; break; case ':': /* This isn't a default after all. Reset the position to the beginning, and continue processing at the exception list. */ p = start; goto exceptions; break; case END: def = endian; goto end; break; default: goto error; break; } exceptions: /* Loop over all exceptions. */ while(1) { tok = next_token (); switch (tok) { case NATIVE: if (next_token () != ':') goto error; endian = GFC_CONVERT_NATIVE; break; case SWAP: if (next_token () != ':') goto error; endian = GFC_CONVERT_SWAP; break; case LITTLE: if (next_token () != ':') goto error; endian = GFC_CONVERT_LITTLE; break; case BIG: if (next_token () != ':') goto error; endian = GFC_CONVERT_BIG; break; case INTEGER: push_token (); break; case END: goto end; break; default: goto error; break; } /* We arrive here when we want to parse a list of numbers. */ continue_ulist = 1; do { tok = next_token (); if (tok != INTEGER) goto error; unit1 = unit_num; tok = next_token (); /* The number can be followed by a - and another number, which means that this is a unit range, a comma or a semicolon. */ if (tok == '-') { if (next_token () != INTEGER) goto error; mark_range (unit1, unit_num); tok = next_token (); if (tok == END) goto end; else if (tok == ';') continue_ulist = 0; else if (tok != ',') goto error; } else { mark_single (unit1); switch (tok) { case ';': continue_ulist = 0; break; case ',': break; case END: goto end; break; default: goto error; } } } while (continue_ulist); } end: return 0; error: def = GFC_CONVERT_NONE; return -1; } void init_unformatted (variable * v) { char *val; val = getenv (v->name); def = GFC_CONVERT_NONE; n_elist = 0; if (val == NULL) return; do_count = 1; p = val; do_parse (); if (do_count <= 0) { n_elist = 0; elist = NULL; } else { elist = get_mem (unit_count * sizeof (exception_t)); do_count = 0; p = val; do_parse (); } } /* Get the default conversion for for an unformatted unit. */ unit_convert get_unformatted_convert (int unit) { int i; if (elist == NULL) return def; else if (search_unit (unit, &i)) return elist[i].conv; else return def; }
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