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#include <limits.h>
#include <stdlib.h>
#include <string.h>
static char *expanduser(const char *path) {
// replace tilde
char *res = NULL;
char *tilde_pos = strchr(path, '~');
if (tilde_pos != NULL) {
char *home = getenv("HOME");
if (home != NULL) {
// allocate a new string based with the new len
size_t home_len = strlen(home);
size_t path_len = strlen(path);
size_t total_len = path_len + home_len;
res = malloc(total_len);
size_t initial_len = tilde_pos - path;
strncpy(res, path, initial_len);
strncpy(res + initial_len, home, home_len);
size_t rest_len = path_len - initial_len - 1;
strncpy(res + initial_len + home_len, path + initial_len + 1, rest_len);
res[total_len - 1] = '\0';
}
}
return res != NULL ? res : strdup(path);
}
static char *to_abspath(const char *path) {
char *exp = expanduser(path);
char *p = realpath(path, NULL);
if (p != NULL) {
free(exp);
return p;
} else {
return exp;
}
}
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