Jeff Abrahamson wrote:
> I want to recursively traverse a directory. It seems dumb to write
> this from scratch (and easy to goof on corner cases), but I haven't
> found anything in glib / gtk / etc. that seems to address it. (Yeah,
> this is more of a glib question than a gtk question, I guess.)
>
The following proglet exercises a function called read_directory(),
which traverses a directory. I often use it as a template for other
programs requiring this functionality. The section on file utility
functions in the Glib documentation may be worth a read as well.
/* gcc -g -Wall -Werror -o walker walker.c */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
static void read_directory(char *);
static void usage(void);
int main(int argc, char *argv[]) {
char path[MAXPATHLEN] = "";
if(argc != 1 && argc != 3) {
usage();
return 1;
}
if(argc == 3) {
if(strcmp(argv[1], "-p")) {
usage();
return 1;
} else if(strlen(argv[2]) >= MAXPATHLEN) {
fprintf(stderr, "Startpath is too long\n");
return 1;
} else {
strcpy(path, argv[argc - 1]);
}
} else if(!getcwd(path, MAXPATHLEN)) {
perror("getcwd");
return 1;
}
read_directory(path);
return 0;
}
void read_directory(char *path) {
unsigned pathlen;
char *pathptr;
DIR *dir;
struct dirent *d;
struct stat s;
pathlen = strlen(path);
pathptr = path + pathlen;
if(!(dir = opendir(path)))
return;
printf("DIR %s\n", path);
while((d = readdir(dir))) {
if(!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
if(pathlen + strlen(d->d_name) + 2 > MAXPATHLEN) {
fprintf(stderr, "Fatal error: path too long\n");
exit(1);
}
sprintf(pathptr, "/%s", d->d_name);
if(lstat(path, &s) != 0)
continue;
if(S_ISREG(s.st_mode))
printf("FILE %s\n", path);
else if(S_ISDIR(s.st_mode))
read_directory(path);
}
closedir(dir);
}
void usage(void) {
fprintf(stderr, "Usage: walker [-p <startpath>]\n");
}
Chris
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