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authorDan McGee <dan@archlinux.org>2011-07-05 14:16:17 -0500
committerDan McGee <dan@archlinux.org>2011-07-05 21:29:02 -0500
commitae7139adcfa65991c71616e8de7910ff722d4166 (patch)
tree2126517e48edf71ae49e51fa264cc8ea4b946f81 /src
parentdfc532668d4a4182ce196a895fdd5b017b505c6f (diff)
Remove most usages of strncmp()
The supposed safety blanket of this function is better handled by explicit length checking and usages of strlen() on known NULL-terminated strings rather than hoping things fit in a buffer. We also have no need to fully fill a PATH_MAX length variable with NULLs every time as long as a single terminating byte is there. Remove usages of it by using strcpy() or memcpy() as appropriate, after doing length checks via strlen(). Signed-off-by: Dan McGee <dan@archlinux.org>
Diffstat (limited to 'src')
-rw-r--r--src/pacman/query.c17
-rw-r--r--src/pacman/util.c11
-rw-r--r--src/util/vercmp.c2
3 files changed, 15 insertions, 15 deletions
diff --git a/src/pacman/query.c b/src/pacman/query.c
index 90329b33..251c4dd6 100644
--- a/src/pacman/query.c
+++ b/src/pacman/query.c
@@ -110,8 +110,7 @@ static int query_fileowner(alpm_list_t *targets)
int ret = 0;
char path[PATH_MAX];
const char *root;
- char *append;
- size_t max_length;
+ size_t rootlen;
alpm_list_t *t;
alpm_db_t *db_local;
@@ -125,9 +124,13 @@ static int query_fileowner(alpm_list_t *targets)
* once, then we can just overwrite whatever file was there on the previous
* iteration. */
root = alpm_option_get_root(config->handle);
- strncpy(path, root, PATH_MAX - 1);
- append = path + strlen(path);
- max_length = PATH_MAX - (append - path) - 1;
+ rootlen = strlen(root);
+ if(rootlen + 1 > PATH_MAX) {
+ /* we are in trouble here */
+ pm_fprintf(stderr, ALPM_LOG_ERROR, _("path too long: %s%s\n"), root, "");
+ return 1;
+ }
+ strcpy(path, root);
db_local = alpm_option_get_localdb(config->handle);
@@ -208,11 +211,11 @@ static int query_fileowner(alpm_list_t *targets)
continue;
}
- if(strlen(pkgfile) > max_length) {
+ if(rootlen + 1 + strlen(pkgfile) > PATH_MAX) {
pm_fprintf(stderr, ALPM_LOG_ERROR, _("path too long: %s%s\n"), root, pkgfile);
}
/* concatenate our file and the root path */
- strcpy(append, pkgfile);
+ strcpy(path + rootlen, pkgfile);
pdname = mdirname(path);
ppath = resolve_path(pdname);
diff --git a/src/pacman/util.c b/src/pacman/util.c
index deb3e056..7065abdc 100644
--- a/src/pacman/util.c
+++ b/src/pacman/util.c
@@ -389,22 +389,21 @@ char *strreplace(const char *str, const char *needle, const char *replace)
* x "size difference between replace and needle" */
newsz = strlen(str) + 1 +
alpm_list_count(list) * (replacesz - needlesz);
- newstr = malloc(newsz);
+ newstr = calloc(newsz, sizeof(char));
if(!newstr) {
return NULL;
}
- *newstr = '\0';
p = str;
newp = newstr;
for(i = list; i; i = alpm_list_next(i)) {
q = alpm_list_getdata(i);
- if(q > p){
+ if(q > p) {
/* add chars between this occurence and last occurence, if any */
- strncpy(newp, p, (size_t)(q - p));
+ memcpy(newp, p, (size_t)(q - p));
newp += q - p;
}
- strncpy(newp, replace, replacesz);
+ memcpy(newp, replace, replacesz);
newp += replacesz;
p = q + needlesz;
}
@@ -413,9 +412,7 @@ char *strreplace(const char *str, const char *needle, const char *replace)
if(*p) {
/* add the rest of 'p' */
strcpy(newp, p);
- newp += strlen(p);
}
- *newp = '\0';
return newstr;
}
diff --git a/src/util/vercmp.c b/src/util/vercmp.c
index 88cf49a6..f4356fb4 100644
--- a/src/util/vercmp.c
+++ b/src/util/vercmp.c
@@ -20,7 +20,7 @@
#include <stdlib.h>
#include <stdio.h> /* printf */
-#include <string.h> /* strncpy */
+#include <string.h>
#define BASENAME "vercmp"