66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
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* Copyright (c) Camden Dixie O'Brien
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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#include "compile.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define BUFFER_START_CAPACITY 128
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#define PREFIX ".*("
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#define PREFIX_LEN 3
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#define SUFFIX ").*"
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#define SUFFIX_LEN 3
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: %s REGEX\n", argv[0]);
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return EXIT_FAILURE;
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}
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const int input_len = strlen(argv[1]);
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const int regex_len = input_len + 6;
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char *regex = malloc(regex_len);
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memcpy(regex, PREFIX, PREFIX_LEN);
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memcpy(regex + PREFIX_LEN, argv[1], input_len);
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memcpy(regex + PREFIX_LEN + input_len, SUFFIX, SUFFIX_LEN);
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fsa_t dfa;
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if (!compile(regex, regex_len, &dfa)) {
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fprintf(stderr, "Failed to parse regex\n");
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return EXIT_FAILURE;
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}
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int len = 0, capacity = BUFFER_START_CAPACITY;
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char *buffer = malloc(capacity);
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assert(NULL != buffer);
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int c;
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while ((c = getchar()) != EOF) {
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if (capacity < len + 1) {
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capacity *= 2;
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buffer = realloc(buffer, capacity);
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assert(NULL != buffer);
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}
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if ('\n' == c) {
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if (fsa_accepts(&dfa, buffer, len)) {
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buffer[len++] = '\n';
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fwrite(buffer, 1, len, stdout);
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}
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len = 0;
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} else {
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buffer[len++] = c;
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}
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}
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fsa_free(&dfa);
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free(buffer);
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return EXIT_SUCCESS;
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}
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