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/* argcv.c - simple functions for parsing input based on whitespace
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <ctype.h>
#include "argcv.h"
/*
* takes a string and splits it into several strings, breaking at ' '
* command is the string to split
* the number of strings is placed into argc
* the split strings are put into argv
* returns 0 on success, nonzero on failure
*/
#define isws(c) ((c)==' '||(c)=='\t'||(c)=='\n')
#define isdelim(c,delim) ((c)=='"'||strchr(delim,(c))!=NULL)
static int
argcv_scan (int len, const char *command, const char *delim, const char* cmnt,
int *start, int *end, int *save)
{
int i = 0;
for (;;)
{
i = *save;
if (i >= len)
return i + 1;
/* Skip initial whitespace */
while (i < len && isws (command[i]))
i++;
*start = i;
switch (command[i])
{
case '"':
case '\'':
while (++i < len && command[i] != command[*start])
;
if (i < len) /* found matching quote */
break;
/*FALLTHRU*/ default:
if (isdelim (command[i], delim))
break;
/* Skip until next whitespace character or end of line */
while (++i < len &&
!(isws (command[i]) || isdelim (command[i], delim)))
;
i--;
break;
}
*end = i;
*save = i + 1;
/* If we have a token, and it starts with a comment character, skip
to the newline and restart the token search. */
if (*save <= len)
{
if (cmnt && strchr (cmnt, command[*start]) != NULL)
{
i = *save;
while (i < len && command[i] != '\n')
i++;
*save = i;
continue;
}
}
break;
}
return *save;
}
int
argcv_get (const char *command, const char *delim, const char* cmnt,
int *argc, char ***argv)
{
int len = strlen (command);
int i = 0;
int start, end, save;
*argv = NULL;
/* Count number of arguments */
*argc = 0;
save = 0;
while (argcv_scan (len, command, delim, cmnt, &start, &end, &save) <= len)
(*argc)++;
*argv = calloc ((*argc + 1), sizeof (char *));
i = 0;
save = 0;
for (i = 0; i < *argc; i++)
{
int n;
argcv_scan (len, command, delim, cmnt, &start, &end, &save);
/* FIXME: this is the right place to do unescaping as well
as stripping of quotes. */
if (command[start] == '"' && command[end] == '"')
{
start++;
end--;
}
else if (command[start] == '\'' && command[end] == '\'')
{
start++;
end--;
}
n = end - start + 1;
(*argv)[i] = calloc (n+1, sizeof (char));
if ((*argv)[i] == NULL)
return 1;
memcpy ((*argv)[i], &command[start], n);
(*argv)[i][n] = 0;
}
(*argv)[i] = NULL;
return 0;
}
/*
* frees all elements of an argv array
* argc is the number of elements
* argv is the array
*/
int
argcv_free (int argc, char **argv)
{
while (--argc >= 0)
if (argv[argc])
free (argv[argc]);
free (argv);
return 1;
}
/* Take a argv an make string separated by ' '. */
int
argcv_string (int argc, char **argv, char **pstring)
{
int i;
size_t len;
char *buffer;
/* No need. */
if (pstring == NULL)
return 1;
buffer = malloc (1);
if (buffer == NULL)
return 1;
*buffer = '\0';
for (len = i = 0; i < argc; i++)
{
len += strlen (argv[i]) + 2;
buffer = realloc (buffer, len);
if (buffer == NULL)
return 1;
if (i != 0)
strcat (buffer, " ");
strcat (buffer, argv[i]);
}
/* Strip off trailing space. */
if (*buffer != '\0')
{
while (buffer[strlen (buffer) - 1] == ' ')
{
buffer[strlen (buffer) - 1] = '\0';
}
}
if (pstring)
*pstring = buffer;
return 0;
}
#if 0
char *command = "set prompt=\"& \" ";
main(int xargc, char **xargv)
{
int i, argc;
char **argv;
argcv_get (xargv[1] ? xargv[1]:command, "=", "#", &argc, &argv);
printf ("%d args:\n", argc);
for (i = 0; i < argc; i++)
printf ("%s\n", argv[i]);
}
#endif
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