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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 before BEFORE, which should be an
existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end.
Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN,
ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not
in ARGZ, EINVAL is returned, else if memory can't be allocated for the new
ARGZ, ENOMEM is returned, else 0. */
error_t
argz_insert (char **argz, unsigned *argz_len, char *before, char *entry)
{
if (! before)
return argz_add (argz, argz_len, entry);
if (before < *argz || before >= *argz + *argz_len)
return EINVAL;
if (before > argz)
/* Make sure before is actually the beginning of an entry. */
while (before[-1])
before--;
{
unsigned after_before = *argz_len - (before - *argz);
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)
{
before = new_argz + (before - *argz);
bcopy (before, before + entry_len, after_before);
bcopy (entry, before, entry_len);
*argz = new_argz;
*argz_len = new_argz_len;
return 0;
}
else
return ENOMEM;
}
}
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