rework langinfo code for ABI compat and for use by time code

[musl] / src / stdio / getdelim.c

diff --git a/src/stdio/getdelim.c b/src/stdio/getdelim.c
index f770d20..26093a6 100644 (file)
--- a/src/stdio/getdelim.c
+++ b/src/stdio/getdelim.c
@@ -1,13 +1,17 @@
 #include "stdio_impl.h"
+#include <string.h>
+#include <inttypes.h>
+#include <errno.h>
 
 #define MIN(a,b) ((a)<(b) ? (a) : (b))
 
-ssize_t getdelim(char **s, size_t *n, int delim, FILE *f)
+ssize_t getdelim(char **restrict s, size_t *restrict n, int delim, FILE *restrict f)
 {
        char *tmp;
        unsigned char *z;
        size_t k;
        size_t i=0;
+       int c;
 
        if (!n || !s) {
                errno = EINVAL;
@@ -18,16 +22,16 @@ ssize_t getdelim(char **s, size_t *n, int delim, FILE *f)
 
        FLOCK(f);
 
-       while (!feof(f)) {
+       for (;;) {
                z = memchr(f->rpos, delim, f->rend - f->rpos);
                k = z ? z - f->rpos + 1 : f->rend - f->rpos;
                if (i+k >= *n) {
-                       if (k >= SIZE_MAX-i) goto oom;
-                       *n = i+k+1;
-                       if (*n < SIZE_MAX/2) *n *= 2;
+                       if (k >= SIZE_MAX/2-i) goto oom;
+                       *n = i+k+2;
+                       if (*n < SIZE_MAX/4) *n *= 2;
                        tmp = realloc(*s, *n);
                        if (!tmp) {
-                               *n = i+k+1;
+                               *n = i+k+2;
                                tmp = realloc(*s, *n);
                                if (!tmp) goto oom;
                        }
@@ -37,23 +41,24 @@ ssize_t getdelim(char **s, size_t *n, int delim, FILE *f)
                f->rpos += k;
                i += k;
                if (z) break;
-               __underflow(f);
+               if ((c = getc_unlocked(f)) == EOF) {
+                       if (!i || !feof(f)) {
+                               FUNLOCK(f);
+                               return -1;
+                       }
+                       break;
+               }
+               if (((*s)[i++] = c) == delim) break;
        }
        (*s)[i] = 0;
-       if (feof(f) || ferror(f)) {
-               FUNLOCK(f);
-               return -1;
-       }
 
        FUNLOCK(f);
 
-       if (i > SSIZE_MAX) {
-               errno = EOVERFLOW;
-               return -1;
-       }
-
        return i;
 oom:
+       FUNLOCK(f);
        errno = ENOMEM;
        return -1;
 }
+
+weak_alias(getdelim, __getdelim);