/* Create and destroy argument vectors (argv's)
- Copyright (C) 1992 Free Software Foundation, Inc.
+ Copyright (C) 1992, 2001 Free Software Foundation, Inc.
Written by Fred Fish @ Cygnus Support
This file is part of the libiberty library.
#include "ansidecl.h"
#include "libiberty.h"
-#ifdef isspace
-#undef isspace
-#endif
-#define isspace(ch) ((ch) == ' ' || (ch) == '\t')
+#define ISBLANK(ch) ((ch) == ' ' || (ch) == '\t')
/* Routines imported from standard C runtime libraries. */
#ifdef __STDC__
#include <stddef.h>
-extern void *memcpy (void *s1, const void *s2, size_t n); /* 4.11.2.1 */
-extern size_t strlen (const char *s); /* 4.11.6.3 */
-extern void *malloc (size_t size); /* 4.10.3.3 */
-extern void *realloc (void *ptr, size_t size); /* 4.10.3.4 */
-extern void free (void *ptr); /* 4.10.3.2 */
-extern char *strdup (const char *s); /* Non-ANSI */
+#include <string.h>
+#include <stdlib.h>
#else /* !__STDC__ */
#endif /* __STDC__ */
-#include "alloca-conf.h"
#ifndef NULL
#define NULL 0
/*
-NAME
+@deftypefn Extension char** dupargv (char **@var{vector})
- freeargv -- free an argument 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.
-SYNOPSIS
+@end deftypefn
- void freeargv (vector)
- char **vector;
+*/
-DESCRIPTION
+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;
+}
+
+/*
- Free an argument vector that was built using buildargv. Simply scans
- through the vector, freeing the memory for each argument until the
- terminating NULL is found, and then frees the vector itself.
+@deftypefn Extension void freeargv (char **@var{vector})
-RETURNS
+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.
- No value.
+@end deftypefn
*/
/*
-NAME
-
- buildargv -- build an argument vector from a string
-
-SYNOPSIS
-
- char **buildargv (sp)
- char *sp;
-
-DESCRIPTION
+@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.
+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 malloc. All of the memory can be returned to the
- system with the single function call freeargv, which takes the
- returned result of buildargv, as it's argument.
+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.
- The memory for the argv array is dynamically expanded as necessary.
+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.
-RETURNS
+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.
- Returns a pointer to the argument vector if successful. Returns NULL
- if the input string pointer is NULL or if there is insufficient
- memory to complete building the argument vector.
+@end deftypefn
-NOTES
+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.
+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.
- If the input is a null string (as opposed to a NULL pointer), then
- buildarg returns an argv that has one arg, a null 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.
- Argv is always kept terminated with a NULL arg pointer, so it can
- be passed to freeargv at any time, or returned, as appropriate.
*/
char **buildargv (input)
-char *input;
+ const char *input;
{
char *arg;
char *copybuf;
if (input != NULL)
{
- copybuf = alloca (strlen (input) + 1);
+ 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 (isspace (*input))
+ while (ISBLANK (*input))
{
input++;
}
arg = copybuf;
while (*input != EOS)
{
- if (isspace (*input) && !squote && !dquote && !bsquote)
+ if (ISBLANK (*input) && !squote && !dquote && !bsquote)
{
break;
}
argc++;
argv[argc] = NULL;
- while (isspace (*input))
+ while (ISBLANK (*input))
{
input++;
}
/* Simple little test driver. */
-static char *tests[] =
+static const char *const tests[] =
{
"a simple command line",
"arg 'foo' is single quoted",
NULL
};
-main ()
+int main ()
{
char **argv;
- char **test;
+ const char *const *test;
char **targs;
for (test = tests; *test != NULL; test++)
freeargv (argv);
}
+ return 0;
}
#endif /* MAIN */
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