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Copy pathslice2.c
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105 lines (93 loc) · 2.24 KB
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/*
slice - Prints matched substrings (*without* line length limitation)
Copyright (c) 2017 Minero Aoki
This program is free software.
Redistribution and use in source and binary forms,
with or without modification, are permitted.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <regex.h>
static void do_slice(regex_t *pat, FILE *f);
static char* get_line(FILE *f);
static void die(const char *s);
int
main(int argc, char *argv[])
{
regex_t pat;
int err;
int i;
if (argc < 2) {
fputs("no pattern\n", stderr);
exit(1);
}
err = regcomp(&pat, argv[1], REG_EXTENDED | REG_NEWLINE);
if (err != 0) {
char buf[1024];
regerror(err, &pat, buf, sizeof buf);
puts(buf);
exit(1);
}
if (argc == 2) {
do_slice(&pat, stdin);
}
else {
for (i = 2; i < argc; i++) {
FILE *f = fopen(argv[i], "r");
if (!f) die(argv[i]);
do_slice(&pat, f);
fclose(f);
}
}
regfree(&pat);
exit(0);
}
static void
do_slice(regex_t *pat, FILE *src)
{
char *line;
while (line = get_line(src)) {
regmatch_t matched[1];
if (regexec(pat, line, 1, matched, 0) == 0) {
char *str = line + matched[0].rm_so;
regoff_t len = matched[0].rm_eo - matched[0].rm_so;
fwrite(str, len, 1, stdout);
fputc('\n', stdout);
}
free(line);
}
}
static char*
get_line(FILE *src)
{
unsigned char *line; /* バッファ */
size_t capa = 160; /* バッファサイズ */
size_t idx = 0; /* 現在のバッファ書き込み位置 */
int c;
line = malloc(capa);
if (!line) die("malloc");
while ((c = getc(src)) != EOF) {
if (c == '\n')
break;
if (idx == capa - 1) { /* バッファ長チェック */
capa *= 2;
line = realloc(line, capa);
if (!line) die("realloc");
}
line[idx++] = (unsigned char)c;
}
if ((idx == 0) && (c == EOF)) {
free(line);
return NULL;
}
line[idx++] = '\0';
return (char*)line;
}
static void
die(const char *s)
{
perror(s);
exit(1);
}