96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* Copyright (c) 2002-2010 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include <string.h>
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# include <stdlib.h>
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# include <stdio.h>
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# include "ivl_alloc.h"
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char* substitutions(const char*str)
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{
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size_t nbuf = strlen(str) + 1;
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char*buf = malloc(nbuf);
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char*cp = buf;
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while (*str) {
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if ((str[0] == '$') && ((str[1] == '(') || str[1] == '{')) {
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/* If I find a $(x) or ${x} string in the source, replace
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it in the destination with the contents of the
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environment variable x. */
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char*name;
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char*value;
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const char*ep = strchr(str, (str[1]=='(') ? ')' : '}');
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str += 2;
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name = malloc(ep-str+1);
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strncpy(name, str, ep-str);
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name[ep-str] = 0;
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str = ep + 1;
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value = getenv(name);
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if (value == 0) {
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fprintf(stderr, "Warning: environment variable "
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"\"%s\" not found during command file "
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"processing.\n", name);
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free(name);
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continue;
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}
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free(name);
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if (strlen(value) >= (nbuf - (cp-buf))) {
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size_t old_size = cp - buf;
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nbuf = (cp - buf) + strlen(value) + 1;
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buf = realloc(buf, nbuf);
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cp = buf + old_size;
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}
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strcpy(cp, value);
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cp += strlen(cp);
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} else {
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if ( cp == (buf + nbuf) ) {
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size_t old_size = nbuf;
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nbuf = old_size + 32;
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buf = realloc(buf, nbuf);
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cp = buf + old_size;
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}
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*cp++ = *str++;
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}
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}
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/* Add the trailing nul to the string, and reallocate the
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buffer to be a tight fit. */
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if ( cp == (buf + nbuf) ) {
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size_t old_size = nbuf;
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nbuf = old_size + 1;
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buf = realloc(buf, nbuf);
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buf[old_size] = 0;
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} else {
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*cp++ = 0;
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nbuf = cp - buf;
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buf = realloc(buf, nbuf);
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}
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return buf;
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}
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