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/*
* BSD Zero Clause License
*
* Copyright (c) 2023 Thomas Voss
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#define PCRE2_CODE_UNIT_WIDTH 8
#define _POSIX_C_SOURCE 200809L
#include <sys/mman.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pcre2.h>
#define die(...) err(EXIT_FAILURE, __VA_ARGS__)
#define streq(a, b) (strcmp(a, b) == 0)
int rv = EXIT_SUCCESS;
const char *argv0;
static PCRE2_UCHAR errbuf[256];
static int loadfile(char **, char *);
static char *stdio_to_string(void);
static void fsub(char *, pcre2_match_data *, pcre2_code *, char *);
int
main(int argc, char *argv[])
{
int fd = 0, fd2, ec, opt;
char *needle, *haystack, *repl,
*argv0 = argv[0],
*optstr = "dim",
*progargs = "[-dim] pattern file [file ...]";
uint32_t rx_opts = PCRE2_UTF;
pcre2_code *rx;
pcre2_match_data *mdata;
PCRE2_SIZE eo;
static struct option longopts[] = {
{"dotall", no_argument, NULL, 'd'},
{"ignore-case", no_argument, NULL, 'i'},
{"multiline", no_argument, NULL, 'm'},
{ NULL, 0, NULL, 0 }
};
argv0 = argv[0];
while ((opt = getopt_long(argc, argv, optstr, longopts, NULL)) != -1) {
switch (opt) {
case 'd':
rx_opts |= PCRE2_DOTALL;
break;
case 'i':
rx_opts |= PCRE2_CASELESS;
break;
case 'm':
rx_opts |= PCRE2_MULTILINE;
break;
default:
fprintf(stderr, "Usage: %s %s\n", argv0, progargs);
exit(EXIT_FAILURE);
}
}
argc -= optind;
argv += optind;
if (argc < 2) {
fprintf(stderr, "Usage: %s %s\n", argv0, progargs);
exit(EXIT_FAILURE);
}
needle = argv[0];
if (streq(argv[1], "-"))
repl = stdio_to_string();
else
fd = loadfile(&repl, argv[1]);
rx = pcre2_compile((PCRE2_SPTR) needle, PCRE2_ZERO_TERMINATED,
rx_opts, &ec, &eo, NULL);
if (rx == NULL) {
pcre2_get_error_message(ec, errbuf, sizeof(errbuf));
fprintf(stderr,
"%s: Regex compilation failed at offset %d: %s\n",
argv[0], (int) eo, errbuf);
exit(EXIT_FAILURE);
}
mdata = pcre2_match_data_create_from_pattern(rx, NULL);
for (int i = 2; i < argc; i++) {
if (streq(argv[i], "-")) {
haystack = stdio_to_string();
fsub(haystack, mdata, rx, repl);
free(haystack);
} else {
fd2 = loadfile(&haystack, argv[i]);
fsub(haystack, mdata, rx, repl);
close(fd2);
}
}
pcre2_match_data_free(mdata);
pcre2_code_free(rx);
if (!streq(argv[1], "-"))
close(fd);
return rv;
}
int
loadfile(char **s, char *filename)
{
int fd;
struct stat sb;
if ((fd = open(filename, O_RDONLY)) == -1)
die("open: %s", filename);
if (fstat(fd, &sb) == -1)
die("fstat: %s", filename);
*s = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (*s == MAP_FAILED)
die("mmap: %s", filename);
return fd;
}
char *
stdio_to_string(void)
{
char *buf = NULL;
size_t bs = 0;
getdelim(&buf, &bs, EOF, stdin);
return buf;
}
void
fsub(char *haystack, pcre2_match_data *mdata, pcre2_code *rx, char *repl)
{
int rc;
size_t pos = 0;
PCRE2_SPTR haystack_start = (PCRE2_SPTR) haystack;
PCRE2_SIZE *ovec;
(void) repl;
do {
rc = pcre2_match(rx, haystack_start, PCRE2_ZERO_TERMINATED, pos,
0, mdata, NULL);
if (rc == PCRE2_ERROR_NOMATCH) {
if (pos == 0)
rv = EXIT_FAILURE;
break;
}
if (rc < 0) {
fprintf(stderr,
"%s: pcre2_match() failed with code %d\n",
argv0, rc);
pcre2_match_data_free(mdata);
pcre2_code_free(rx);
exit(EXIT_FAILURE);
}
ovec = pcre2_get_ovector_pointer(mdata);
printf("%.*s%s", (int) (ovec[0] - pos), haystack_start + pos,
repl);
pos = ovec[1];
} while (rc >= 0);
fputs((char *) haystack_start + pos, stdout);
}
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