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/*
* Copyright (c) 2002-2010 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include <string.h>
# include <stdlib.h>
# include <stdio.h>
# include "ivl_alloc.h"
# include "globals.h"
char* substitutions(const char*str)
{
size_t nbuf = strlen(str) + 1;
char*buf = malloc(nbuf);
char*cp = buf;
while (*str) {
if ((str[0] == '$') && ((str[1] == '(') || str[1] == '{')) {
/* If I find a $(x) or ${x} string in the source, replace
it in the destination with the contents of the
environment variable x. */
char*name;
char*value;
const char*ep = strchr(str, (str[1]=='(') ? ')' : '}');
str += 2;
name = malloc(ep-str+1);
strncpy(name, str, ep-str);
name[ep-str] = 0;
str = ep + 1;
value = getenv(name);
if (value == 0) {
fprintf(stderr, "Warning: environment variable "
"\"%s\" not found during command file "
"processing.\n", name);
free(name);
continue;
}
free(name);
if (strlen(value) >= (nbuf - (cp-buf))) {
size_t old_size = cp - buf;
nbuf = (cp - buf) + strlen(value) + 1;
buf = realloc(buf, nbuf);
cp = buf + old_size;
}
strcpy(cp, value);
cp += strlen(cp);
} else {
if ( cp == (buf + nbuf) ) {
size_t old_size = nbuf;
nbuf = old_size + 32;
buf = realloc(buf, nbuf);
cp = buf + old_size;
}
*cp++ = *str++;
}
}
/* Add the trailing nul to the string, and reallocate the
buffer to be a tight fit. */
if ( cp == (buf + nbuf) ) {
size_t old_size = nbuf;
nbuf = old_size + 1;
buf = realloc(buf, nbuf);
buf[old_size] = 0;
} else {
*cp++ = 0;
nbuf = cp - buf;
buf = realloc(buf, nbuf);
}
return buf;
}
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