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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)
/* TODO: recurse through headers */
/* TODO: avoid loops */
static struct majefile * find_inc(const struct majefile *file, const regex_t * restrict re)
{
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;
}
struct majefile *inc = 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 header[FILENAME_MAX] = { 0 };
char *start = (char*)base + match[1].rm_so;
memcpy(header, start, match[1].rm_eo - match[1].rm_so);
inc = insert_file(inc, header, NULL);
base = start + match[1].rm_eo;
}
munmap(map, file->st.st_size);
close(fd);
return inc;
}
struct majefile *find_includes(const struct majefile *source)
{
static regex_t re = { .re_nsub = (size_t)-1 };
if (re.re_nsub == (size_t)-1) {
if (regcomp(&re,
"#[[:space:]]*include[[:space:]]+.*\"(.*)\"",
REG_EXTENDED | REG_NEWLINE) != 0) {
fprintf(stderr, "maje: regcomp(#include) failed\n");
abort();
}
}
struct majefile *ret = find_inc(source, &re);
if (ret != NULL) {
while (ret->prev != NULL) {
ret = ret->prev;
}
}
return ret;
}
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