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152 lines (138 loc) · 3.49 KB
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Copy pathtraverse.c
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152 lines (138 loc) · 3.49 KB
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
struct strbuf {
char *ptr;
size_t len;
};
static void traverse(struct strbuf *buf);
static void traverse0(struct strbuf *buf, int first);
static struct strbuf *strbuf_new(void);
static void strbuf_realloc(struct strbuf *buf, size_t size);
static void print_error(char *s);
static char *program_name; /* used by print_error() */
int
main(int argc, char *argv[])
{
struct strbuf *pathbuf;
if (argc != 2) {
fprintf(stderr, "Usage: %s <dir>\n", argv[0]);
exit(1);
}
program_name = argv[0];
pathbuf = strbuf_new();
strbuf_realloc(pathbuf, strlen(argv[1]));
strcpy(pathbuf->ptr, argv[1]);
traverse(pathbuf);
exit(0);
}
static void
traverse(struct strbuf *pathbuf)
{
traverse0(pathbuf, 1);
}
static void
traverse0(struct strbuf *pathbuf, int first)
{
DIR *d;
struct dirent *ent;
struct stat st;
d = opendir(pathbuf->ptr);
if (!d) {
switch (errno) {
case ENOTDIR: /* might be replaced after last readdir(). */
return;
case ENOENT:
if (first) {
print_error(pathbuf->ptr);
exit(1);
}
else {
/* might be removed after last readdir(). */
return;
}
case EACCES: /* ignore permission error. */
puts(pathbuf->ptr);
print_error(pathbuf->ptr);
return;
default:
print_error(pathbuf->ptr);
exit(1);
}
}
puts(pathbuf->ptr);
while (ent = readdir(d)) {
if (strcmp(ent->d_name, ".") == 0) continue;
if (strcmp(ent->d_name, "..") == 0) continue;
strbuf_realloc(pathbuf, pathbuf->len + 1 + strlen(ent->d_name) + 1);
/* special handling for the root directory */
if (strcmp(pathbuf->ptr, "/") != 0) {
strcat(pathbuf->ptr, "/");
}
strcat(pathbuf->ptr, ent->d_name);
if (lstat(pathbuf->ptr, &st) < 0) {
switch (errno) {
case ENOENT: /* might be unlinked after readdir(). */
break;
case EACCES: /* ignore permission error. */
print_error(pathbuf->ptr);
break;
default:
print_error(pathbuf->ptr);
exit(1);
}
}
else {
if (S_ISDIR(st.st_mode) && !S_ISLNK(st.st_mode)) {
traverse0(pathbuf, 0);
}
else {
puts(pathbuf->ptr);
}
}
*strrchr(pathbuf->ptr, '/') = '\0';
}
closedir(d);
}
#define INITLEN 1024
static struct strbuf*
strbuf_new(void)
{
struct strbuf *buf;
buf = (struct strbuf*)malloc(sizeof(struct strbuf));
if (!buf) {
print_error("malloc(3)");
exit(1);
}
buf->ptr = malloc(INITLEN);
if (!buf->ptr) {
print_error("malloc(3)");
exit(1);
}
buf->len = INITLEN;
return buf;
}
static void
strbuf_realloc(struct strbuf *buf, size_t len)
{
char *tmp;
if (buf->len > len) return;
tmp = realloc(buf->ptr, len);
if (!tmp) {
print_error("realloc(3)");
exit(1);
}
buf->ptr = tmp;
buf->len = len;
}
/* imitate find(1)'s error message */
static void
print_error(char *s)
{
fprintf(stderr, "%s: %s: %s\n", program_name, s, strerror(errno));
}