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authorDan McGee <dan@archlinux.org>2011-01-19 12:00:39 -0600
committerDan McGee <dan@archlinux.org>2011-01-21 09:14:47 -0600
commit01c8f39ab8db36ad7ac1c2078a8c1a5b7504192a (patch)
treeb820fe3d07c7178af3f92c451a5c6572bf937753 /lib
parentaff3e63c451ead18571a8abed56e911f71906fe6 (diff)
Improve depends string parsing
Remove the need for an unconditional string duplication by using pointer arithmetic instead, and strndup() instead of an unspecified-length strdup(). This should reduce memory churn a fair amount as this is called pretty frequently during database loads. Signed-off-by: Dan McGee <dan@archlinux.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/libalpm/deps.c53
1 files changed, 20 insertions, 33 deletions
diff --git a/lib/libalpm/deps.c b/lib/libalpm/deps.c
index 3d4b1df4..a7203b4b 100644
--- a/lib/libalpm/deps.c
+++ b/lib/libalpm/deps.c
@@ -322,8 +322,6 @@ static int dep_vercmp(const char *version1, pmdepmod_t mod,
int _alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep)
{
alpm_list_t *i;
- const char *pkgname = pkg->name;
- const char *pkgversion = pkg->version;
int satisfy = 0;
/* check (pkg->name, pkg->version) */
@@ -331,8 +329,8 @@ int _alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep)
&& pkg->name_hash != dep->name_hash) {
/* skip more expensive checks */
} else {
- satisfy = (strcmp(pkgname, dep->name) == 0
- && dep_vercmp(pkgversion, dep->mod, dep->version));
+ satisfy = (strcmp(pkg->name, dep->name) == 0
+ && dep_vercmp(pkg->version, dep->mod, dep->version));
if(satisfy) {
return(satisfy);
}
@@ -366,55 +364,44 @@ int _alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep)
pmdepend_t *_alpm_splitdep(const char *depstring)
{
pmdepend_t *depend;
- char *ptr = NULL;
- char *newstr = NULL;
+ const char *ptr, *version = NULL;
if(depstring == NULL) {
return(NULL);
}
- STRDUP(newstr, depstring, RET_ERR(PM_ERR_MEMORY, NULL));
CALLOC(depend, 1, sizeof(pmdepend_t), RET_ERR(PM_ERR_MEMORY, NULL));
/* Find a version comparator if one exists. If it does, set the type and
* increment the ptr accordingly so we can copy the right strings. */
- if((ptr = strstr(newstr, ">="))) {
+ if((ptr = strstr(depstring, ">="))) {
depend->mod = PM_DEP_MOD_GE;
- *ptr = '\0';
- ptr += 2;
- } else if((ptr = strstr(newstr, "<="))) {
+ version = ptr + 2;
+ } else if((ptr = strstr(depstring, "<="))) {
depend->mod = PM_DEP_MOD_LE;
- *ptr = '\0';
- ptr += 2;
- } else if((ptr = strstr(newstr, "="))) {
+ version = ptr + 2;
+ } else if((ptr = strstr(depstring, "="))) {
/* Note: we must do =,<,> checks after <=, >= checks */
depend->mod = PM_DEP_MOD_EQ;
- *ptr = '\0';
- ptr += 1;
- } else if((ptr = strstr(newstr, "<"))) {
+ version = ptr + 1;
+ } else if((ptr = strstr(depstring, "<"))) {
depend->mod = PM_DEP_MOD_LT;
- *ptr = '\0';
- ptr += 1;
- } else if((ptr = strstr(newstr, ">"))) {
+ version = ptr + 1;
+ } else if((ptr = strstr(depstring, ">"))) {
depend->mod = PM_DEP_MOD_GT;
- *ptr = '\0';
- ptr += 1;
+ version = ptr + 1;
} else {
- /* no version specified - copy the name and return it */
+ /* no version specified, leave version and ptr NULL */
depend->mod = PM_DEP_MOD_ANY;
- STRDUP(depend->name, newstr, RET_ERR(PM_ERR_MEMORY, NULL));
- depend->name_hash = _alpm_hash_sdbm(depend->name);
- depend->version = NULL;
- free(newstr);
- return(depend);
}
- /* if we get here, we have a version comparator, copy the right parts
- * to the right places */
- STRDUP(depend->name, newstr, RET_ERR(PM_ERR_MEMORY, NULL));
+ /* copy the right parts to the right places */
+ STRNDUP(depend->name, depstring, ptr - depstring,
+ RET_ERR(PM_ERR_MEMORY, NULL));
depend->name_hash = _alpm_hash_sdbm(depend->name);
- STRDUP(depend->version, ptr, RET_ERR(PM_ERR_MEMORY, NULL));
- free(newstr);
+ if(version) {
+ STRDUP(depend->version, version, RET_ERR(PM_ERR_MEMORY, NULL));
+ }
return(depend);
}