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/* Routines for dealing with '\0' separated arg vectors.
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program 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 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* ---------------------------------------------------------------- */
/* Make a '\0' separated arg vector from a unix argv vector, returning it in
ARGZ, and the total length in LEN. If a memory allocation error occurs,
ENOMEM is returned, otherwise 0. */
error_t
argz_create(char **argv, char **argz, int *len)
{
int tlen = 0;
char **argp;
for (argp = argv; *argp != NULL; argp++)
tlen += strlen(*argp) + 1;
*len = tlen;
if (tlen == 0)
*argz = NULL;
else
{
*argz = malloc(tlen);
if (*argz == NULL)
return ENOMEM;
while (tlen > 0)
{
tlen -= strlen(*--argp) + 1;
strcpy(*argz + tlen, *argp);
}
}
return 0;
}
/* ---------------------------------------------------------------- */
/* Returns the number of strings in ARGZ. */
int
argz_count (char *argz, int len)
{
int count = 0;
while (len > 0)
{
int part_len = strlen(argz);
argz += part_len + 1;
len -= part_len + 1;
count++;
}
return count;
}
/* ---------------------------------------------------------------- */
/* Puts pointers to each string in ARGZ into ARGV, which must be large enough
to hold them all. */
void
argz_extract (char *argz, int len, char **argv)
{
while (len > 0)
{
int part_len = strlen(argz);
*argv++ = argz;
argz += part_len + 1;
len -= part_len + 1;
}
}
/* ---------------------------------------------------------------- */
/* Make '\0' separated arg vector ARGZ printable by converting all the '\0's
except the last into the character SEP. */
void
argz_stringify(char *argz, int len, int sep)
{
while (len > 0)
{
int part_len = strlen(argz);
argz += part_len;
len -= part_len + 1;
if (len > 0)
*argz++ = sep;
}
}
/* Add BUF, of length BUF_LEN to the argz vector in ARGZ & ARGZ_LEN. */
error_t
argz_append (char **argz, unsigned *argz_len, char *buf, unsigned buf_len)
{
unsigned new_argz_len = *argz_len + buf_len;
char *new_argz = realloc (*argz, new_argz_len);
if (new_argz)
{
bcopy (buf, new_argz + *argz_len, buf_len);
*argz = new_argz;
*argz_len = new_argz_len;
return 0;
}
else
return ENOMEM;
}
/* Add STR to the argz vector in ARGZ & ARGZ_LEN. This should be moved into
argz.c in libshouldbelibc. */
error_t
argz_add (char **argz, unsigned *argz_len, char *str)
{
return argz_append (argz, argz_len, str, strlen (str) + 1);
}
/* Remove ENTRY from ARGZ & ARGZ_LEN, if any. */
void
argz_remove (char **argz, unsigned *argz_len, char *entry)
{
if (entry)
/* Get rid of the old value for NAME. */
{
unsigned entry_len = strlen (entry) + 1;
*argz_len -= entry_len;
bcopy (entry + entry_len, entry, *argz_len - (entry - *argz));
}
}
/* Insert ENTRY into ARGZ & ARGZ_LEN at position N. */
error_t
argz_insert (char **argz, unsigned *argz_len, unsigned n, char *entry)
{
char *place = *argz;
unsigned left = *argz_len;
while (n > 0 && left > 0)
{
int len = strlen (place) + 1;
place += len;
left -= len;
n--;
}
if (left < 0 || n > 0)
return EINVAL;
else
{
unsigned entry_len = strlen (entry) + 1;
unsigned new_argz_len = *argz_len + entry_len;
char *new_argz = realloc (*argz, new_argz_len);
if (new_argz)
{
place = new_argz + (place - *argz);
bcopy (place, place + entry_len, left);
bcopy (entry, place, entry_len);
*argz = new_argz;
*argz_len = new_argz_len;
return 0;
}
else
return ENOMEM;
}
}
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