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Add strlcpy()/strlcat()
Refactor recurse() routine in preparation to moving tar(1) over to use it instead of the ftw() interface.
This commit is contained in:
parent
08ff1c56e7
commit
fb12183c52
4
Makefile
4
Makefile
@ -22,7 +22,9 @@ LIB = \
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util/rm.o \
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util/sha1.o \
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util/sha256.o \
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util/sha512.o
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util/sha512.o \
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util/strlcat.o \
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util/strlcpy.o
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SRC = \
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basename.c \
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4
util.h
4
util.h
@ -1,5 +1,5 @@
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/* See LICENSE file for copyright and license details. */
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#include <stddef.h>
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#include "arg.h"
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#define UTF8_POINT(c) (((c) & 0xc0) != 0x80)
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@ -20,4 +20,6 @@ long estrtol(const char *, int);
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void fnck(const char *, const char *, int (*)(const char *, const char *));
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void putword(const char *);
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void recurse(const char *, void (*)(const char *));
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size_t strlcat(char *, const char *, size_t);
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size_t strlcpy(char *, const char *, size_t);
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void weprintf(const char *, ...);
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@ -1,17 +1,19 @@
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/* See LICENSE file for copyright and license details. */
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#include <dirent.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "../util.h"
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void
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recurse(const char *path, void (*fn)(const char *))
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{
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char *cwd;
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char buf[PATH_MAX], *p;
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struct dirent *d;
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struct stat st;
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DIR *dp;
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@ -22,19 +24,19 @@ recurse(const char *path, void (*fn)(const char *))
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eprintf("opendir %s:", path);
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}
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cwd = agetcwd();
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if(chdir(path) == -1)
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eprintf("chdir %s:", path);
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while((d = readdir(dp))) {
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if(strcmp(d->d_name, ".") && strcmp(d->d_name, ".."))
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fn(d->d_name);
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if (strcmp(d->d_name, ".") == 0 ||
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strcmp(d->d_name, "..") == 0)
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continue;
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strlcpy(buf, path, sizeof(buf));
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p = strrchr(buf, '\0');
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/* remove all trailing slashes */
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while (--p >= buf && *p == '/') *p ='\0';
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strlcat(buf, "/", sizeof(buf));
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if (strlcat(buf, d->d_name, sizeof(buf)) >= sizeof(buf))
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enprintf(EXIT_FAILURE, "path too long\n");
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fn(buf);
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}
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closedir(dp);
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if(chdir(cwd) == -1)
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eprintf("chdir %s:", cwd);
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free(cwd);
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}
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35
util/strlcat.c
Normal file
35
util/strlcat.c
Normal file
@ -0,0 +1,35 @@
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/* Taken from OpenBSD */
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#include <sys/types.h>
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#include <string.h>
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/*
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* Appends src to string dst of size siz (unlike strncat, siz is the
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* full size of dst, not space left). At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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* Returns strlen(src) + MIN(siz, strlen(initial dst)).
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* If retval >= siz, truncation occurred.
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*/
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size_t
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strlcat(char *dst, const char *src, size_t siz)
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{
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char *d = dst;
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const char *s = src;
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size_t n = siz;
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size_t dlen;
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/* Find the end of dst and adjust bytes left but don't go past end */
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while (n-- != 0 && *d != '\0')
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d++;
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dlen = d - dst;
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n = siz - dlen;
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if (n == 0)
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return(dlen + strlen(s));
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while (*s != '\0') {
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if (n != 1) {
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*d++ = *s;
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n--;
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}
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s++;
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}
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*d = '\0';
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return(dlen + (s - src)); /* count does not include NUL */
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}
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31
util/strlcpy.c
Normal file
31
util/strlcpy.c
Normal file
@ -0,0 +1,31 @@
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/* Taken from OpenBSD */
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#include <sys/types.h>
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#include <string.h>
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/*
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* Copy src to string dst of size siz. At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz == 0).
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* Returns strlen(src); if retval >= siz, truncation occurred.
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*/
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size_t
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strlcpy(char *dst, const char *src, size_t siz)
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{
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char *d = dst;
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const char *s = src;
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size_t n = siz;
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/* Copy as many bytes as will fit */
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if (n != 0) {
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while (--n != 0) {
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if ((*d++ = *s++) == '\0')
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break;
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}
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}
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/* Not enough room in dst, add NUL and traverse rest of src */
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if (n == 0) {
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if (siz != 0)
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*d = '\0'; /* NUL-terminate dst */
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while (*s++)
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;
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}
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return(s - src - 1); /* count does not include NUL */
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}
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