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/* Create and destroy argument vectors (argv's)
   Copyright (C) 1992, 2001 Free Software Foundation, Inc.
   Written by Fred Fish @ Cygnus Support
 
This file is part of the libiberty library.
Libiberty 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.
 
Libiberty 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 libiberty; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
 
 
/*  Create and destroy argument vectors.  An argument vector is simply an
    array of string pointers, terminated by a NULL pointer. */
 
#include "ansidecl.h"
#include "libiberty.h"
 
#define ISBLANK(ch) ((ch) == ' ' || (ch) == '\t')
 
/*  Routines imported from standard C runtime libraries. */
 
#ifdef __STDC__
 
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
 
#else   /* !__STDC__ */
 
#if !defined _WIN32 || defined __GNUC__
extern char *memcpy ();         /* Copy memory region */
extern int strlen ();           /* Count length of string */
extern char *malloc ();         /* Standard memory allocater */
extern char *realloc ();        /* Standard memory reallocator */
extern void free ();            /* Free malloc'd memory */
extern char *strdup ();         /* Duplicate a string */
#endif
 
#endif  /* __STDC__ */
 
 
#ifndef NULL
#define NULL 0
#endif
 
#ifndef EOS
#define EOS '\0'
#endif
 
#define INITIAL_MAXARGC 8       /* Number of args + NULL in initial argv */
 
 
/*
 
@deftypefn Extension char** dupargv (char **@var{vector})
 
Duplicate an argument vector.  Simply scans through @var{vector},
duplicating each argument until the terminating @code{NULL} is found.
Returns a pointer to the argument vector if successful.  Returns
@code{NULL} if there is insufficient memory to complete building the
argument vector.
 
@end deftypefn
 
*/
 
char **
dupargv (argv)
     char **argv;
{
  int argc;
  char **copy;
 
  if (argv == NULL)
    return NULL;
 
  /* the vector */
  for (argc = 0; argv[argc] != NULL; argc++);
  copy = (char **) malloc ((argc + 1) * sizeof (char *));
  if (copy == NULL)
    return NULL;
 
  /* the strings */
  for (argc = 0; argv[argc] != NULL; argc++)
    {
      int len = strlen (argv[argc]);
      copy[argc] = malloc (sizeof (char *) * (len + 1));
      if (copy[argc] == NULL)
        {
          freeargv (copy);
          return NULL;
        }
      strcpy (copy[argc], argv[argc]);
    }
  copy[argc] = NULL;
  return copy;
}
 
/*
 
@deftypefn Extension void freeargv (char **@var{vector})
 
Free an argument vector that was built using @code{buildargv}.  Simply
scans through @var{vector}, freeing the memory for each argument until
the terminating @code{NULL} is found, and then frees @var{vector}
itself.
 
@end deftypefn
 
*/
 
void freeargv (vector)
char **vector;
{
  register char **scan;
 
  if (vector != NULL)
    {
      for (scan = vector; *scan != NULL; scan++)
        {
          free (*scan);
        }
      free (vector);
    }
}
 
/*
 
@deftypefn Extension char** buildargv (char *@var{sp})
 
Given a pointer to a string, parse the string extracting fields
separated by whitespace and optionally enclosed within either single
or double quotes (which are stripped off), and build a vector of
pointers to copies of the string for each field.  The input string
remains unchanged.  The last element of the vector is followed by a
@code{NULL} element.
 
All of the memory for the pointer array and copies of the string
is obtained from @code{malloc}.  All of the memory can be returned to the
system with the single function call @code{freeargv}, which takes the
returned result of @code{buildargv}, as it's argument.
 
Returns a pointer to the argument vector if successful.  Returns
@code{NULL} if @var{sp} is @code{NULL} or if there is insufficient
memory to complete building the argument vector.
 
If the input is a null string (as opposed to a @code{NULL} pointer),
then buildarg returns an argument vector that has one arg, a null
string.
 
@end deftypefn
 
The memory for the argv array is dynamically expanded as necessary.
 
In order to provide a working buffer for extracting arguments into,
with appropriate stripping of quotes and translation of backslash
sequences, we allocate a working buffer at least as long as the input
string.  This ensures that we always have enough space in which to
work, since the extracted arg is never larger than the input string.
 
The argument vector is always kept terminated with a @code{NULL} arg
pointer, so it can be passed to @code{freeargv} at any time, or
returned, as appropriate.
 
*/
 
char **buildargv (input)
     const char *input;
{
  char *arg;
  char *copybuf;
  int squote = 0;
  int dquote = 0;
  int bsquote = 0;
  int argc = 0;
  int maxargc = 0;
  char **argv = NULL;
  char **nargv;
 
  if (input != NULL)
    {
      copybuf = (char *) alloca (strlen (input) + 1);
      /* Is a do{}while to always execute the loop once.  Always return an
         argv, even for null strings.  See NOTES above, test case below. */
      do
        {
          /* Pick off argv[argc] */
          while (ISBLANK (*input))
            {
              input++;
            }
          if ((maxargc == 0) || (argc >= (maxargc - 1)))
            {
              /* argv needs initialization, or expansion */
              if (argv == NULL)
                {
                  maxargc = INITIAL_MAXARGC;
                  nargv = (char **) malloc (maxargc * sizeof (char *));
                }
              else
                {
                  maxargc *= 2;
                  nargv = (char **) realloc (argv, maxargc * sizeof (char *));
                }
              if (nargv == NULL)
                {
                  if (argv != NULL)
                    {
                      freeargv (argv);
                      argv = NULL;
                    }
                  break;
                }
              argv = nargv;
              argv[argc] = NULL;
            }
          /* Begin scanning arg */
          arg = copybuf;
          while (*input != EOS)
            {
              if (ISBLANK (*input) && !squote && !dquote && !bsquote)
                {
                  break;
                }
              else
                {
                  if (bsquote)
                    {
                      bsquote = 0;
                      *arg++ = *input;
                    }
                  else if (*input == '\\')
                    {
                      bsquote = 1;
                    }
                  else if (squote)
                    {
                      if (*input == '\'')
                        {
                          squote = 0;
                        }
                      else
                        {
                          *arg++ = *input;
                        }
                    }
                  else if (dquote)
                    {
                      if (*input == '"')
                        {
                          dquote = 0;
                        }
                      else
                        {
                          *arg++ = *input;
                        }
                    }
                  else
                    {
                      if (*input == '\'')
                        {
                          squote = 1;
                        }
                      else if (*input == '"')
                        {
                          dquote = 1;
                        }
                      else
                        {
                          *arg++ = *input;
                        }
                    }
                  input++;
                }
            }
          *arg = EOS;
          argv[argc] = strdup (copybuf);
          if (argv[argc] == NULL)
            {
              freeargv (argv);
              argv = NULL;
              break;
            }
          argc++;
          argv[argc] = NULL;
 
          while (ISBLANK (*input))
            {
              input++;
            }
        }
      while (*input != EOS);
    }
  return (argv);
}
 
#ifdef MAIN
 
/* Simple little test driver. */
 
static const char *const tests[] =
{
  "a simple command line",
  "arg 'foo' is single quoted",
  "arg \"bar\" is double quoted",
  "arg \"foo bar\" has embedded whitespace",
  "arg 'Jack said \\'hi\\'' has single quotes",
  "arg 'Jack said \\\"hi\\\"' has double quotes",
  "a b c d e f g h i j k l m n o p q r s t u v w x y z 1 2 3 4 5 6 7 8 9",
 
  /* This should be expanded into only one argument.  */
  "trailing-whitespace ",
 
  "",
  NULL
};
 
int main ()
{
  char **argv;
  const char *const *test;
  char **targs;
 
  for (test = tests; *test != NULL; test++)
    {
      printf ("buildargv(\"%s\")\n", *test);
      if ((argv = buildargv (*test)) == NULL)
        {
          printf ("failed!\n\n");
        }
      else
        {
          for (targs = argv; *targs != NULL; targs++)
            {
              printf ("\t\"%s\"\n", *targs);
            }
          printf ("\n");
        }
      freeargv (argv);
    }
 
  return 0;
}
 
#endif  /* MAIN */

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[/] [or1k/] [trunk/] [gdb-5.3/] [libiberty/] [argv.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1181	sfurman	`/* Create and destroy argument vectors (argv's)`
2			`Copyright (C) 1992, 2001 Free Software Foundation, Inc.`
3			`Written by Fred Fish @ Cygnus Support`
4
5			`This file is part of the libiberty library.`
6			`Libiberty is free software; you can redistribute it and/or`
7			`modify it under the terms of the GNU Library General Public`
8			`License as published by the Free Software Foundation; either`
9			`version 2 of the License, or (at your option) any later version.`
10
11			`Libiberty is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
14			`Library General Public License for more details.`
15
16			`You should have received a copy of the GNU Library General Public`
17			`License along with libiberty; see the file COPYING.LIB. If`
18			`not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,`
19			`Boston, MA 02111-1307, USA. */`
20
21
22			`/* Create and destroy argument vectors. An argument vector is simply an`
23			`array of string pointers, terminated by a NULL pointer. */`
24
25			`#include "ansidecl.h"`
26			`#include "libiberty.h"`
27
28			`#define ISBLANK(ch) ((ch) == ' ' \|\| (ch) == '\t')`
29
30			`/* Routines imported from standard C runtime libraries. */`
31
32			`#ifdef __STDC__`
33
34			`#include <stddef.h>`
35			`#include <string.h>`
36			`#include <stdlib.h>`
37
38			`#else /* !__STDC__ */`
39
40			`#if !defined _WIN32 \|\| defined __GNUC__`
41			`extern char memcpy (); / Copy memory region */`
42			`extern int strlen (); /* Count length of string */`
43			`extern char malloc (); / Standard memory allocater */`
44			`extern char realloc (); / Standard memory reallocator */`
45			`extern void free (); /* Free malloc'd memory */`
46			`extern char strdup (); / Duplicate a string */`
47			`#endif`
48
49			`#endif /* __STDC__ */`
50
51
52			`#ifndef NULL`
53			`#define NULL 0`
54			`#endif`
55
56			`#ifndef EOS`
57			`#define EOS '\0'`
58			`#endif`
59
60			`#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */`
61
62
63			`/*`
64
65			`@deftypefn Extension char dupargv (char @var{vector})`
66
67			`Duplicate an argument vector. Simply scans through @var{vector},`
68			`duplicating each argument until the terminating @code{NULL} is found.`
69			`Returns a pointer to the argument vector if successful. Returns`
70			`@code{NULL} if there is insufficient memory to complete building the`
71			`argument vector.`
72
73			`@end deftypefn`
74
75			`*/`
76
77			`char **`
78			`dupargv (argv)`
79			`char **argv;`
80			`{`
81			`int argc;`
82			`char **copy;`
83
84			`if (argv == NULL)`
85			`return NULL;`
86
87			`/* the vector */`
88			`for (argc = 0; argv[argc] != NULL; argc++);`
89			`copy = (char *) malloc ((argc + 1) sizeof (char *));`
90			`if (copy == NULL)`
91			`return NULL;`
92
93			`/* the strings */`
94			`for (argc = 0; argv[argc] != NULL; argc++)`
95			`{`
96			`int len = strlen (argv[argc]);`
97			`copy[argc] = malloc (sizeof (char ) (len + 1));`
98			`if (copy[argc] == NULL)`
99			`{`
100			`freeargv (copy);`
101			`return NULL;`
102			`}`
103			`strcpy (copy[argc], argv[argc]);`
104			`}`
105			`copy[argc] = NULL;`
106			`return copy;`
107			`}`
108
109			`/*`
110
111			`@deftypefn Extension void freeargv (char **@var{vector})`
112
113			`Free an argument vector that was built using @code{buildargv}. Simply`
114			`scans through @var{vector}, freeing the memory for each argument until`
115			`the terminating @code{NULL} is found, and then frees @var{vector}`
116			`itself.`
117
118			`@end deftypefn`
119
120			`*/`
121
122			`void freeargv (vector)`
123			`char **vector;`
124			`{`
125			`register char **scan;`
126
127			`if (vector != NULL)`
128			`{`
129			`for (scan = vector; *scan != NULL; scan++)`
130			`{`
131			`free (*scan);`
132			`}`
133			`free (vector);`
134			`}`
135			`}`
136
137			`/*`
138
139			`@deftypefn Extension char** buildargv (char *@var{sp})`
140
141			`Given a pointer to a string, parse the string extracting fields`
142			`separated by whitespace and optionally enclosed within either single`
143			`or double quotes (which are stripped off), and build a vector of`
144			`pointers to copies of the string for each field. The input string`
145			`remains unchanged. The last element of the vector is followed by a`
146			`@code{NULL} element.`
147
148			`All of the memory for the pointer array and copies of the string`
149			`is obtained from @code{malloc}. All of the memory can be returned to the`
150			`system with the single function call @code{freeargv}, which takes the`
151			`returned result of @code{buildargv}, as it's argument.`
152
153			`Returns a pointer to the argument vector if successful. Returns`
154			`@code{NULL} if @var{sp} is @code{NULL} or if there is insufficient`
155			`memory to complete building the argument vector.`
156
157			`If the input is a null string (as opposed to a @code{NULL} pointer),`
158			`then buildarg returns an argument vector that has one arg, a null`
159			`string.`
160
161			`@end deftypefn`
162
163			`The memory for the argv array is dynamically expanded as necessary.`
164
165			`In order to provide a working buffer for extracting arguments into,`
166			`with appropriate stripping of quotes and translation of backslash`
167			`sequences, we allocate a working buffer at least as long as the input`
168			`string. This ensures that we always have enough space in which to`
169			`work, since the extracted arg is never larger than the input string.`
170
171			`The argument vector is always kept terminated with a @code{NULL} arg`
172			`pointer, so it can be passed to @code{freeargv} at any time, or`
173			`returned, as appropriate.`
174
175			`*/`
176
177			`char **buildargv (input)`
178			`const char *input;`
179			`{`
180			`char *arg;`
181			`char *copybuf;`
182			`int squote = 0;`
183			`int dquote = 0;`
184			`int bsquote = 0;`
185			`int argc = 0;`
186			`int maxargc = 0;`
187			`char **argv = NULL;`
188			`char **nargv;`
189
190			`if (input != NULL)`
191			`{`
192			`copybuf = (char *) alloca (strlen (input) + 1);`
193			`/* Is a do{}while to always execute the loop once. Always return an`
194			`argv, even for null strings. See NOTES above, test case below. */`
195			`do`
196			`{`
197			`/* Pick off argv[argc] */`
198			`while (ISBLANK (*input))`
199			`{`
200			`input++;`
201			`}`
202			`if ((maxargc == 0) \|\| (argc >= (maxargc - 1)))`
203			`{`
204			`/* argv needs initialization, or expansion */`
205			`if (argv == NULL)`
206			`{`
207			`maxargc = INITIAL_MAXARGC;`
208			`nargv = (char *) malloc (maxargc sizeof (char *));`
209			`}`
210			`else`
211			`{`
212			`maxargc *= 2;`
213			`nargv = (char *) realloc (argv, maxargc sizeof (char *));`
214			`}`
215			`if (nargv == NULL)`
216			`{`
217			`if (argv != NULL)`
218			`{`
219			`freeargv (argv);`
220			`argv = NULL;`
221			`}`
222			`break;`
223			`}`
224			`argv = nargv;`
225			`argv[argc] = NULL;`
226			`}`
227			`/* Begin scanning arg */`
228			`arg = copybuf;`
229			`while (*input != EOS)`
230			`{`
231			`if (ISBLANK (*input) && !squote && !dquote && !bsquote)`
232			`{`
233			`break;`
234			`}`
235			`else`
236			`{`
237			`if (bsquote)`
238			`{`
239			`bsquote = 0;`
240			`arg++ = input;`
241			`}`
242			`else if (*input == '\\')`
243			`{`
244			`bsquote = 1;`
245			`}`
246			`else if (squote)`
247			`{`
248			`if (*input == '\'')`
249			`{`
250			`squote = 0;`
251			`}`
252			`else`
253			`{`
254			`arg++ = input;`
255			`}`
256			`}`
257			`else if (dquote)`
258			`{`
259			`if (*input == '"')`
260			`{`
261			`dquote = 0;`
262			`}`
263			`else`
264			`{`
265			`arg++ = input;`
266			`}`
267			`}`
268			`else`
269			`{`
270			`if (*input == '\'')`
271			`{`
272			`squote = 1;`
273			`}`
274			`else if (*input == '"')`
275			`{`
276			`dquote = 1;`
277			`}`
278			`else`
279			`{`
280			`arg++ = input;`
281			`}`
282			`}`
283			`input++;`
284			`}`
285			`}`
286			`*arg = EOS;`
287			`argv[argc] = strdup (copybuf);`
288			`if (argv[argc] == NULL)`
289			`{`
290			`freeargv (argv);`
291			`argv = NULL;`
292			`break;`
293			`}`
294			`argc++;`
295			`argv[argc] = NULL;`
296
297			`while (ISBLANK (*input))`
298			`{`
299			`input++;`
300			`}`
301			`}`
302			`while (*input != EOS);`
303			`}`
304			`return (argv);`
305			`}`
306
307			`#ifdef MAIN`
308
309			`/* Simple little test driver. */`
310
311			`static const char *const tests[] =`
312			`{`
313			`"a simple command line",`
314			`"arg 'foo' is single quoted",`
315			`"arg \"bar\" is double quoted",`
316			`"arg \"foo bar\" has embedded whitespace",`
317			`"arg 'Jack said \\'hi\\'' has single quotes",`
318			`"arg 'Jack said \\\"hi\\\"' has double quotes",`
319			`"a b c d e f g h i j k l m n o p q r s t u v w x y z 1 2 3 4 5 6 7 8 9",`
320
321			`/* This should be expanded into only one argument. */`
322			`"trailing-whitespace ",`
323
324			`"",`
325			`NULL`
326			`};`
327
328			`int main ()`
329			`{`
330			`char **argv;`
331			`const char const test;`
332			`char **targs;`
333
334			`for (test = tests; *test != NULL; test++)`
335			`{`
336			`printf ("buildargv(\"%s\")\n", *test);`
337			`if ((argv = buildargv (*test)) == NULL)`
338			`{`
339			`printf ("failed!\n\n");`
340			`}`
341			`else`
342			`{`
343			`for (targs = argv; *targs != NULL; targs++)`
344			`{`
345			`printf ("\t\"%s\"\n", *targs);`
346			`}`
347			`printf ("\n");`
348			`}`
349			`freeargv (argv);`
350			`}`
351
352			`return 0;`
353			`}`
354
355			`#endif /* MAIN */`