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Reduce libc.so's memory footprint by lazily allocating memory used internally

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by basename() and dirname().
Reviewed by: eric
This commit is contained in:
Rob Braun 2002-12-21 07:12:35 +00:00
parent 2226ce021a
commit 5fb691beab
2 changed files with 16 additions and 4 deletions
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10
lib/libc/gen/basename.c
View File

@ -42,9 +42,15 @@ char *
basename(path) basename(path)
const char *path; const char *path;
{ {
static char bname[MAXPATHLEN]; static char *bname = NULL;
const char *endp, *startp; const char *endp, *startp;
if (bname == NULL) {
bname = (char *)malloc(MAXPATHLEN);
if (bname == NULL)
return(NULL);
}
/* Empty or NULL string gets treated as "." */ /* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') { if (path == NULL || *path == '\0') {
(void)strcpy(bname, "."); (void)strcpy(bname, ".");
@ -67,7 +73,7 @@ basename(path)
while (startp > path && *(startp - 1) != '/') while (startp > path && *(startp - 1) != '/')
startp--; startp--;
if (endp - startp + 2 > sizeof(bname)) { if (endp - startp + 2 > MAXPATHLEN) {
errno = ENAMETOOLONG; errno = ENAMETOOLONG;
return(NULL); return(NULL);
} }

10
lib/libc/gen/dirname.c
View File

@ -42,9 +42,15 @@ char *
dirname(path) dirname(path)
const char *path; const char *path;
{ {
static char bname[MAXPATHLEN]; static char *bname = NULL;
const char *endp; const char *endp;
if (bname == NULL) {
bname = (char *)malloc(MAXPATHLEN);
if (bname == NULL)
return(NULL);
}
/* Empty or NULL string gets treated as "." */ /* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') { if (path == NULL || *path == '\0') {
(void)strcpy(bname, "."); (void)strcpy(bname, ".");
@ -70,7 +76,7 @@ dirname(path)
} while (endp > path && *endp == '/'); } while (endp > path && *endp == '/');
} }
if (endp - path + 2 > sizeof(bname)) { if (endp - path + 2 > MAXPATHLEN) {
errno = ENAMETOOLONG; errno = ENAMETOOLONG;
return(NULL); return(NULL);
} }