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int basename_r(const char* path, char* buffer, size_t bufflen)
{
const char *endp, *startp;
int len, result;
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
startp = ".";
len = 1;
goto Exit;
}
/* Strip trailing slashes */
endp = path + strlen(path) - 1;
while (endp > path && *endp == '/')
endp--;
/* All slashes becomes "/" */
if (endp == path && *endp == '/') {
startp = "/";
len = 1;
goto Exit;
}
/* Find the start of the base */
startp = endp;
while (startp > path && *(startp - 1) != '/')
startp--;
len = endp - startp +1;
Exit:
result = len;
if (buffer == NULL) {
return result;
}
if (len > (int)bufflen-1) {
len = (int)bufflen-1;
result = -1;
errno = ERANGE;
}
if (len >= 0) {
memcpy( buffer, startp, len );
buffer[len] = 0;
}
return result;
}
char* BaseName(const char* path) {
static char* bname = NULL;
int ret;
if (bname == NULL) {
bname = (char *)malloc(PATH_MAX);
if (bname == NULL)
return(NULL);
}
ret = basename_r(path, bname, PATH_MAX);
return (ret < 0) ? NULL : bname;
}
int
dirname_r(const char* path, char* buffer, size_t bufflen)
{
const char *endp, *startp;
int result, len;
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
startp = ".";
len = 1;
goto Exit;
}
/* Strip trailing slashes */
endp = path + strlen(path) - 1;
while (endp > path && *endp == '/')
endp--;
/* Find the start of the dir */
while (endp > path && *endp != '/')
endp--;
/* Either the dir is "/" or there are no slashes */
if (endp == path) {
startp = (*endp == '/') ? "/" : ".";
len = 1;
goto Exit;
}
do {
endp--;
} while (endp > path && *endp == '/');
startp = path;
len = endp - startp +1;
Exit:
result = len;
if (len+1 > PATH_MAX) {
errno = ENAMETOOLONG;
return -1;
}
if (buffer == NULL)
return result;
if (len > (int)bufflen-1) {
len = (int)bufflen-1;
result = -1;
errno = ERANGE;
}
if (len >= 0) {
memcpy( buffer, startp, len );
buffer[len] = 0;
}
return result;
}
char* DirName(const char* path) {
static char* bname = NULL;
int ret;
if (bname == NULL) {
bname = (char *)malloc(PATH_MAX);
if (bname == NULL)
return(NULL);
}
ret = dirname_r(path, bname, PATH_MAX);
return (ret < 0) ? NULL : bname;
}
int main(int argc, char **argv) {
if (argc != 2)
printf("usage: bin [path/to/name]\n");
else {
printf("basename=%s\n", BaseName(argv[1]));
char cmd[PATH_MAX];
sprintf(cmd, "basename %s", argv[1]);
system(cmd);
printf("dirname=%s\n", DirName(argv[1]));
sprintf(cmd, "dirname %s", argv[1]);
system(cmd);
printf("original:%s\n", argv[1]);
}
return 0;
}
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