1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#define _XOPEN_SOURCE 700
#include <fcntl.h>
#include <regex.h>
#include <sys/mman.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "maje.h"
static bool matches(const struct majefile * restrict file, const regex_t * restrict re)
{
bool ret = false;
int fd = open(file->path, O_RDONLY);
if (fd == -1) {
return false;
}
void *map = mmap(NULL, (size_t)file->st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (map == MAP_FAILED) {
close(fd);
return false;
}
if (regexec(re, map, (size_t)file->st.st_size, NULL, 0) == 0) {
ret = true;
}
munmap(map, file->st.st_size);
close(fd);
return ret;
}
char *find_main(struct majefile *sources)
{
regex_t re;
int rc = regcomp(&re, "int[[:space:]]+main[[:space:]]*\\(",
REG_EXTENDED | REG_NEWLINE | REG_NOSUB);
if (rc != 0) {
fprintf(stderr, "maje: regcomp() failed\n");
abort();
}
char *ret = NULL;
for (struct majefile *src = sources; src != NULL; src = src->next) {
if (matches(src, &re)) {
ret = src->path;
break;
}
}
regfree(&re);
return ret;
}
|
