Add portable fgetln(3) from OpenBSD make(1).

diff --git a/fgetln.c b/fgetln.c
new file mode 100644 (file)
index 0000000..098216f
--- /dev/null
+++ b/fgetln.c
@@ -0,0 +1,144 @@
+/* fgetln.c -- Portable fgetln(3) implementation from OpenBSD.
+ *
+ * $Id$
+ */
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* $OpenBSD: memory.c,v 1.1 2001/05/23 12:34:47 espie Exp $ */
+
+/*
+ * Copyright (c) 1988, 1989, 1990, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 1989 by Berkeley Softworks
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Adam de Boor.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * enomem --
+ *     die when out of memory.
+ */
+void
+enomem(size)
+       size_t size;
+{
+       fprintf(stderr, "make: %s (%lu)\n", strerror(errno), (u_long)size);
+       exit(2);
+}
+
+/*
+ * erealloc --
+ *     realloc, but die on error.
+ */
+static void *
+erealloc(ptr, size)
+       void *ptr;
+       size_t size;
+{
+       if ((ptr = realloc(ptr, size)) == NULL)
+               enomem(size);
+       return ptr;
+}
+
+/*
+ * emalloc --
+ *     malloc, but die on error.
+ */
+static void *
+emalloc(len)
+       size_t len;
+{
+       void *p;
+
+       if ((p = malloc(len)) == NULL)
+               enomem(len);
+       return p;
+}
+
+/*     $OpenBSD: util.c,v 1.18 2002/05/29 09:23:25 deraadt Exp $       */
+
+/*
+ * Copyright (c) 2001 Marc Espie.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OPENBSD
+ * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+char *
+fgetln(stream, len)
+FILE *stream;
+size_t *len;
+{
+    static char *buffer = NULL;
+    static size_t buflen = 0;
+
+    if (buflen == 0) {
+        buflen = 512;
+        buffer = emalloc(buflen+1);
+    }
+    if (fgets(buffer, buflen+1, stream) == NULL)
+        return NULL;
+    *len = strlen(buffer);
+    while (*len == buflen && buffer[*len-1] != '\n') {
+        buffer = erealloc(buffer, 2*buflen + 1);
+        if (fgets(buffer + buflen, buflen + 1, stream) == NULL)
+            return NULL;
+        *len += strlen(buffer + buflen);
+        buflen *= 2;
+    }
+    return buffer;
+}