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#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <pwd.h>
#include <regex.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include "util/debug.h"
#include "util/error.h"
#include "util/loop_args.h"
#include "util/versie.h"
#include "io/read_file.h"
static char *gpats;
static bool fixed = false;
static bool extended = false;
static bool icase = false;
static bool binary = false;
static bool list = false;
static bool invert = false;
static bool quiet = false;
static size_t npat = 0;
static void **patterns = NULL; // can hold `char*` or `regex_t*`
static size_t nfiles;
static bool anyMatch = false;
static void usage(FILE *f) {
fprintf(f,
"Gebruik: grijp [-hV] [PATRONEN] [BESTAND]...\n"
"\n"
"TODO\n"
"\n"
" -h Toon deze hulptekst\n"
" -V Toon versienummer\n");
}
// Returns pointer to argument array containing patterns and then the file names
static char** parse_options(int argc, char **argv) {
int opt;
while ((opt = getopt(argc, argv, "FiEUlLvqhV")) != -1) {
switch (opt) {
case 'F':
fixed = true;
break;
case 'i':
icase = true;
break;
case 'E':
extended = true;
break;
case 'U':
binary = true;
break;
case 'l':
list = true;
break;
case 'L':
invert = true;
list = true;
break;
case 'v':
invert = true;
break;
case 'q':
quiet = true;
break;
case 'h':
usage(stdout);
exit(0);
case 'V':
drukkedoos_print_versie(stdout);
exit(0);
case '?':
fprintf(stderr, "grijp: Ongeldige optie: -%c\n", optopt);
usage(stderr);
exit(2);
}
}
return argv + optind;
}
static void parse_patterns() {
size_t cappat = 1 << 4;
patterns = calloc(cappat, sizeof(char*));
char *s = gpats;
size_t cursor = 0;
while (true) {
const size_t lfidx = strchrnul(s + cursor, '\n') - s;
const bool last = s[lfidx] == '\0';
s[lfidx] = '\0';
if (npat == cappat) {
cappat *= 2;
patterns = realloc(patterns, sizeof(char*)*cappat);
}
patterns[npat] = strdup(s + cursor);
npat++;
cursor = lfidx + 1;
if (last) break;
}
}
static void compile_regexps() {
for (size_t i = 0; i < npat; i++) {
regex_t *regexp = calloc(1, sizeof(regex_t));
int flags = 0;
if (extended) flags |= REG_EXTENDED;
if (icase) flags |= REG_ICASE;
if (regcomp(regexp, patterns[i], flags) != 0) {
fprintf(stderr, "grijp: fout tijdens compileren van reguliere expressie\n");
exit(2);
}
free(patterns[i]);
patterns[i] = regexp;
}
}
static void print_match(char *fname, char *line) {
if (quiet) return;
if (list) {
printf("%s\n", fname);
return;
}
if (nfiles >= 2) {
printf("%s:", fname);
}
printf("%s\n", line);
}
static int process(char *fname, bool isstdin) {
FILE *stream = isstdin ? stdin : fopen(fname, binary ? "rb" : "r");
if (stream == NULL && !isstdin) {
fprintf(stderr, "grijp: %s: fout tijdens openen bestand\n", fname);
return 2;
} else if (stream == NULL && isstdin) {
fprintf(stderr, "grijp: fout tijdens lezen standaard invoer\n");
return 2;
}
char *line = NULL;
size_t linecap = 0;
ssize_t nread = 0;
while ((errno = 0, nread = getline(&line, &linecap, stream)) != -1) {
if (nread > 0 && line[nread-1] == '\n') line[--nread] = '\0';
for (size_t i = 0; i < npat; i++) {
bool matches = false;
if (fixed) {
char *pat = patterns[i];
matches = (strstr(line, pat) != NULL);
} else {
regex_t *regexp = patterns[i];
regmatch_t pmatch;
matches = (regexec(regexp, line, 1, &pmatch, 0) == 0);
}
if (invert) matches = !matches;
if (matches) {
anyMatch = true;
print_match(fname, line);
if (list) goto done;
break;
}
}
}
done:
free(line);
if (!isstdin) fclose(stream);
return 0;
}
int entry_grijp(int argc, char **argv) {
char **args = parse_options(argc, argv);
if (*args == NULL) {
fprintf(stderr, "grijp: geen patroon gegeven\n");
return 2;
}
gpats = *args;
args++;
// count the amount of files provided
for (nfiles = 0; args[nfiles] != NULL; nfiles++);
parse_patterns();
int res = 0;
if (fixed) {
res = loop_args(args, process);
} else {
compile_regexps();
res = loop_args(args, process);
for (size_t i = 0; i < npat; i++) regfree(patterns[i]);
}
for (size_t i = 0; i < npat; i++) free(patterns[i]);
free(patterns);
if (res == 0 && !anyMatch) res = 1;
return res;
}
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