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#define _XOPEN_SOURCE 700
#include <fcntl.h>
#include <regex.h>
#include <sys/mman.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "maje.h"
#define MAX_MATCHES (2)
static struct majeflag * find_flags(const struct majefile *file, const regex_t * restrict re, struct majeflag *flags)
{
int fd = open(file->path, O_RDONLY);
if (fd == -1) {
return NULL;
}
void *map = mmap(NULL, (size_t)file->st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (map == MAP_FAILED) {
close(fd);
return NULL;
}
regmatch_t match[MAX_MATCHES];
void *base = map;
while (regexec(re, base, MAX_MATCHES, match, 0) == 0) {
if (match[1].rm_so == -1) {
break;
}
char flag[FILENAME_MAX] = { 0 };
char *start = (char*)base + match[1].rm_so;
memcpy(flag, start, match[1].rm_eo - match[1].rm_so);
flags = insert_flag(flags, flag);
base = start + match[1].rm_eo;
}
munmap(map, file->st.st_size);
close(fd);
return flags;
}
struct majeflag *add_flags(const struct majefile *source, struct majeflag *flags)
{
static regex_t re = { .re_nsub = (size_t)-1 };
if (re.re_nsub == (size_t)-1) {
if (regcomp(&re,
"(MAJE_[[:upper:]]+=[^[:space:]]+)",
REG_EXTENDED | REG_NEWLINE) != 0) {
fprintf(stderr, "maje: regcomp(MAJE) failed\n");
abort();
}
}
struct majeflag *ret = find_flags(source, &re, flags);
if (ret != NULL) {
while (ret->prev != NULL) {
ret = ret->prev;
}
}
return ret;
}
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