63 lines
989 B
C
63 lines
989 B
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <regex.h>
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typedef struct {
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char *pattern;
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regex_t rgex;
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} PATTERN;
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PATTERN *regexs;
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size_t r_size;
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int addpattern(char *str) {
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if (regexs == NULL) {
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regexs = malloc(sizeof(PATTERN));
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if (regexs == NULL) {
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fprintf(stderr, "grep: malloc failed\n");
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return 1;
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}
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}
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regexs = realloc(regexs, (r_size + 1) * sizeof(PATTERN));
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if (regexs == NULL) {
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fprintf(stderr, "grep: malloc failed\n");
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return 1;
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}
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regexs[r_size].pattern = str;
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r_size++;
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return 0;
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}
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int main(int argc, char **argv) {
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int opt;
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while ((opt = getopt(argc, argv, "e:")) != -1) {
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switch (opt) {
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case 'e':
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if (addpattern(optarg))
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return 1;
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break;
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default:
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printf("grep [e] [PATTERN | -e PATTERN] [FILE]\n");
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return 0;
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}
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}
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argv += optind;
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argc -= optind;
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if (r_size == 0) {
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fprintf(stderr, "grep: no patterns specified\n");
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return 1;
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}
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free(regexs);
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return 0;
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}
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