Bump version to 1.32.0

[oweals/busybox.git] / libbb / fgets_str.c

diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c
index 7d41d72f1d63c4ada9e670f720b43167fb461dee..1a7f2e9e090b3731da1bd674028c098d2b31c1da 100644 (file)
--- a/libbb/fgets_str.c
+++ b/libbb/fgets_str.c
@@ -1,31 +1,15 @@
+/* vi: set sw=4 ts=4: */
 /*
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
+ * Utility routines.
  *
- *  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 Library General Public License for more details.
+ * Copyright (C) many different people.
+ * If you wrote this, please acknowledge your work.
  *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+#include "libbb.h"
 
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/*
- * Continue reading from file until the terminating string is encountered.
- * Return data as string.
- * e.g. fgets_str(file, "\n"); will read till end of file
- */
-
-char *fgets_str(FILE *file, const char *terminating_string)
+static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off, size_t *maxsz_p)
 {
        char *linebuf = NULL;
        const int term_length = strlen(terminating_string);
@@ -33,16 +17,24 @@ char *fgets_str(FILE *file, const char *terminating_string)
        int linebufsz = 0;
        int idx = 0;
        int ch;
+       size_t maxsz = *maxsz_p;
 
        while (1) {
                ch = fgetc(file);
                if (ch == EOF) {
+                       if (idx == 0)
+                               return linebuf; /* NULL */
                        break;
                }
 
-               /* grow the line buffer as necessary */
-               while (idx > linebufsz - 2) {
-                       linebuf = realloc(linebuf, linebufsz += 1000); /* GROWBY */
+               if (idx >= linebufsz) {
+                       linebufsz += 200;
+                       linebuf = xrealloc(linebuf, linebufsz);
+                       if (idx >= maxsz) {
+                               linebuf[idx] = ch;
+                               idx++;
+                               break;
+                       }
                }
 
                linebuf[idx] = ch;
@@ -50,15 +42,44 @@ char *fgets_str(FILE *file, const char *terminating_string)
 
                /* Check for terminating string */
                end_string_offset = idx - term_length;
-               if ((end_string_offset > 0) && (memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0)) {
-                       idx -= term_length;
+               if (end_string_offset >= 0
+                && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
+               ) {
+                       if (chop_off)
+                               idx -= term_length;
                        break;
                }
        }
-       if (idx == 0 || linebuf[0] == '\n') {
-               return NULL;
-       }
+       /* Grow/shrink *first*, then store NUL */
+       linebuf = xrealloc(linebuf, idx + 1);
        linebuf[idx] = '\0';
-       return(linebuf);
+       *maxsz_p = idx;
+       return linebuf;
+}
+
+/* Read up to TERMINATING_STRING from FILE and return it,
+ * including terminating string.
+ * Non-terminated string can be returned if EOF is reached.
+ * Return NULL if EOF is reached immediately.  */
+char* FAST_FUNC xmalloc_fgets_str(FILE *file, const char *terminating_string)
+{
+       size_t maxsz = INT_MAX - 4095;
+       return xmalloc_fgets_internal(file, terminating_string, 0, &maxsz);
+}
+
+char* FAST_FUNC xmalloc_fgets_str_len(FILE *file, const char *terminating_string, size_t *maxsz_p)
+{
+       size_t maxsz;
+
+       if (!maxsz_p) {
+               maxsz = INT_MAX - 4095;
+               maxsz_p = &maxsz;
+       }
+       return xmalloc_fgets_internal(file, terminating_string, 0, maxsz_p);
 }
 
+char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
+{
+       size_t maxsz = INT_MAX - 4095;
+       return xmalloc_fgets_internal(file, terminating_string, 1, &maxsz);
+}