Replacement for getdelim and getline - fixes #3503

compat/getdelim.c

+/*****************************************************************************
+ * getdelim.c: POSIX getdelim() and getline() replacements
+ *****************************************************************************
+ * Copyright © 2010 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+ssize_t getdelim (char **restrict lineptr, size_t *restrict n,
+                  int delimiter, FILE *restrict stream)
+{
+    char *ptr = *lineptr;
+    size_t size = (ptr != NULL) ? *n : 0;
+    size_t len = 0;
+
+    for (;;)
+    {
+        if ((size - len) <= 2)
+        {
+            size = size ? (size * 2) : 256;
+            ptr = realloc (*lineptr, size);
+            if (ptr == NULL)
+                return -1;
+            *lineptr = ptr;
+            *n = size;
+        }
+
+        int c = fgetc (stream);
+        if (c == -1)
+        {
+            if (len == 0 || ferror (stream))
+                return -1;
+            break; /* EOF */
+        }
+        ptr[len++] = c;
+        if (c == delimiter)
+            break;
+    }
+
+    ptr[len] = '\0';
+    return len;
+}
+
+ssize_t getline (char **restrict lineptr, size_t *restrict n,
+                 FILE *restrict stream)
+{
+    return getdelim (lineptr, n, '\n', stream);
+}

configure.ac

@@ -549,7 +549,7 @@ need_libc=false
 
 dnl Check for usual libc functions
 AC_CHECK_FUNCS([ctime_r daemon fcntl fdopendir fork getenv getpwuid_r gettimeofday isatty lstat memalign posix_fadvise posix_madvise posix_memalign putenv setenv setlocale stricmp strnicmp tdestroy uselocale])
-AC_REPLACE_FUNCS([asprintf atof atoll getcwd getpid gmtime_r lldiv localtime_r nrand48 rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab vasprintf])
+AC_REPLACE_FUNCS([asprintf atof atoll getcwd getdelim getpid gmtime_r lldiv localtime_r nrand48 rewind strcasecmp strcasestr strdup strlcpy strncasecmp strndup strnlen strsep strtof strtok_r strtoll swab vasprintf])
 AC_CHECK_FUNCS(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
 ])

include/vlc_fixups.h

@@ -43,7 +43,8 @@ typedef struct
 # include <stddef.h> /* NULL */
 #endif
 
-#ifndef HAVE_REWIND
+#if !defined (HAVE_REWIND) || \
+    !defined (HAVE_GETDELIM)
 # include <stdio.h> /* FILE */
 #endif
 
@@ -142,6 +143,11 @@ void rewind (FILE *);
 char *getcwd (char *buf, size_t size);
 #endif
 
+#ifndef HAVE_GETDELIM
+ssize_t getdelim (char **, size_t *, int, FILE *);
+ssize_t getline (char **, size_t *, FILE *);
+#endif
+
 #ifndef HAVE_GETPID
 pid_t getpid (void);
 #endif