Move declarations of str{,n}casecmp from <string.h> to <strings.h>.

[gnulib.git] / lib / getdelim.c

diff --git a/lib/getdelim.c b/lib/getdelim.c
index 8dacb73..0547c7f 100644 (file)
--- a/lib/getdelim.c
+++ b/lib/getdelim.c
@@ -1,5 +1,5 @@
 /* getdelim.c --- Implementation of replacement getdelim function.
-   Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005 Free
+   Copyright (C) 1994, 1996, 1997, 1998, 2001, 2003, 2005, 2006, 2007 Free
    Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or
@@ -19,15 +19,20 @@
 
 /* Ported from glibc by Simon Josefsson. */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+#include <stdio.h>
 
+#include <limits.h>
 #include <stdlib.h>
 #include <errno.h>
 
-#include "getdelim.h"
-
+#ifndef SIZE_MAX
+# define SIZE_MAX ((size_t) -1)
+#endif
+#ifndef SSIZE_MAX
+# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
+#endif
 #if !HAVE_FLOCKFILE
 # undef flockfile
 # define flockfile(x) ((void) 0)
@@ -37,6 +42,11 @@
 # define funlockfile(x) ((void) 0)
 #endif
 
+/* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW.  */
+#ifndef EOVERFLOW
+# define EOVERFLOW E2BIG
+#endif
+
 /* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
    NUL-terminate it).  *LINEPTR is a pointer returned from malloc (or
    NULL), pointing to *N characters of space.  It is realloc'ed as
@@ -46,8 +56,8 @@
 ssize_t
 getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
 {
-  int result = 0;
-  ssize_t cur_len = 0;
+  ssize_t result;
+  size_t cur_len = 0;
 
   if (lineptr == NULL || n == NULL || fp == NULL)
     {
@@ -60,7 +70,7 @@ getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
   if (*lineptr == NULL || *n == 0)
     {
       *n = 120;
-      *lineptr = (char *) malloc (*n);
+      *lineptr = (char *) realloc (*lineptr, *n);
       if (*lineptr == NULL)
        {
          result = -1;
@@ -74,20 +84,25 @@ getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
 
       i = getc (fp);
       if (i == EOF)
-      {
-       result = -1;
-       break;
-      }
+       {
+         result = -1;
+         break;
+       }
 
       /* Make enough space for len+1 (for final NUL) bytes.  */
       if (cur_len + 1 >= *n)
        {
-         size_t needed = 2 * (cur_len + 1) + 1;   /* Be generous. */
+         size_t needed_max =
+           SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
+         size_t needed = 2 * *n + 1;   /* Be generous. */
          char *new_lineptr;
 
-         if (needed < cur_len)
+         if (needed_max < needed)
+           needed = needed_max;
+         if (cur_len + 1 >= needed)
            {
              result = -1;
+             errno = EOVERFLOW;
              goto unlock_return;
            }
 
@@ -112,6 +127,7 @@ getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
   result = cur_len ? cur_len : result;
 
  unlock_return:
-  funlockfile (fp);
+  funlockfile (fp); /* doesn't set errno */
+
   return result;
 }