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args.c
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args.c
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/*
* ISC License
*
* Copyright (c) 2021, Tommi Leino <namhas@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <ctype.h>
#include <string.h>
/*
* Parse space separated string to array elements until reaching a limit,
* which can be the maximum array size, or smaller arbitrary limit where
* rest of the string is squeezed to one array element.
*
* Returns the number of array elements used.
* Modifies the supplied string.
*/
size_t
parse_args(char *p, char **argv, size_t limit)
{
char *q;
size_t argc;
argc = 0;
while (p != NULL && (argc+1) < limit && *p != '\0') {
while (isspace(*p))
p++;
q = strchr(p, ' ');
if (q != NULL)
*q++ = '\0';
argv[argc++] = p;
p = q;
}
if (p != NULL)
argv[argc++] = p;
return argc;
}
#ifdef TEST
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char **argv)
{
size_t c, i;
char *v[3], *p;
p = strdup("arg arg2 and a longer string");
c = parse_args(p, v, 3);
for (i = 0; i < c; i++)
printf("v[%zu] = %s\n", i, v[i]);
free(p);
p = strdup("?");
c = parse_args(p, v, 3);
printf("c: %zu\n", c);
for (i = 0; i < c; i++)
printf("v[%zu] = %s\n", i, v[i]);
}
#endif