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#define _XOPEN_SOURCE 700
#include <assert.h>
#include <fcntl.h>
#include <regex.h>
#include <sys/mman.h>
#include <stdbool.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);
assert(rc == 0);
char *ret = NULL;
for (struct majefile **src = sources; *src != NULL; src++) {
if (matches(*src, &re)) {
ret = (*src)->path;
break;
}
}
regfree(&re);
return ret;
}
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