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73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) 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, see <https://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "util.h"
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char *strexpand(const char *inp, size_t argc, const char *const *argv)
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{
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char *out, *dst;
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const char *ptr;
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size_t i, len;
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ptr = inp;
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len = 0;
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while (*ptr != '\0') {
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if (ptr[0] == '%' && isdigit(ptr[1])) {
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i = ptr[1] - '0';
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if (i < argc)
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len += strlen(argv[i]);
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ptr += 2;
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} else if (ptr[0] == '%' && ptr[1] == '%') {
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ptr += 2;
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len += 1;
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} else {
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++ptr;
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++len;
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}
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}
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out = calloc(1, len + 1);
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if (out == NULL)
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return NULL;
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dst = out;
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while (*inp != '\0') {
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if (inp[0] == '%' && isdigit(inp[1])) {
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i = inp[1] - '0';
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if (i < argc) {
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len = strlen(argv[i]);
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memcpy(dst, argv[i], len);
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dst += len;
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}
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inp += 2;
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} else if (inp[0] == '%' && inp[1] == '%') {
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*(dst++) = '%';
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inp += 2;
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} else {
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*(dst++) = *(inp++);
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}
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}
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return out;
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}
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