1 files changed, 155 insertions, 0 deletions
diff --git a/lib/openpam_readline.c b/lib/openpam_readline.c
new file mode 100644
index 0000000..17f03f3
--- /dev/null
+++ b/lib/openpam_readline.c
@@ -0,0 +1,155 @@
+/*-
+ * Copyright (c) 2003 Networks Associates Technology, Inc.
+ * Copyright (c) 2004-2007 Dag-Erling Smørgrav
+ * All rights reserved.
+ *
+ * This software was developed for the FreeBSD Project by ThinkSec AS and
+ * Network Associates Laboratories, the Security Research Division of
+ * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
+ * ("CBOSS"), as part of the DARPA CHATS research program.
+ *
+ * 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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $Id: openpam_readline.c 408 2007-12-21 11:36:24Z des $
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <security/pam_appl.h>
+#include "openpam_impl.h"
+
+#define MIN_LINE_LENGTH 128
+
+/*
+ * OpenPAM extension
+ *
+ * Read a line from a file.
+ */
+
+char *
+openpam_readline(FILE *f, int *lineno, size_t *lenp)
+{
+	char *line;
+	size_t len, size;
+	int ch;
+
+	if ((line = malloc(MIN_LINE_LENGTH)) == NULL)
+		return (NULL);
+	size = MIN_LINE_LENGTH;
+	len = 0;
+
+#define line_putch(ch) do { \
+	if (len >= size - 1) { \
+		char *tmp = realloc(line, size *= 2); \
+		if (tmp == NULL) \
+			goto fail; \
+		line = tmp; \
+	} \
+	line[len++] = ch; \
+	line[len] = '\0'; \
+} while (0)
+
+	for (;;) {
+		ch = fgetc(f);
+		/* strip comment */
+		if (ch == '#') {
+			do {
+				ch = fgetc(f);
+			} while (ch != EOF && ch != '\n');
+		}
+		/* eof */
+		if (ch == EOF) {
+			/* remove trailing whitespace */
+			while (len > 0 && isspace((int)line[len - 1]))
+				--len;
+			line[len] = '\0';
+			if (len == 0)
+				goto fail;
+			break;
+		}
+		/* eol */
+		if (ch == '\n') {
+			if (lineno != NULL)
+				++*lineno;
+
+			/* remove trailing whitespace */
+			while (len > 0 && isspace((int)line[len - 1]))
+				--len;
+			line[len] = '\0';
+			/* skip blank lines */
+			if (len == 0)
+				continue;
+			/* continuation */
+			if (line[len - 1] == '\\') {
+				line[--len] = '\0';
+				/* fall through to whitespace case */
+			} else {
+				break;
+			}
+		}
+		/* whitespace */
+		if (isspace(ch)) {
+			/* ignore leading whitespace */
+			/* collapse linear whitespace */
+			if (len > 0 && line[len - 1] != ' ')
+				line_putch(' ');
+			continue;
+		}
+		/* anything else */
+		line_putch(ch);
+	}
+
+	if (lenp != NULL)
+		*lenp = len;
+	return (line);
+ fail:
+	FREE(line);
+	return (NULL);
+}
+
+/**
+ * The =openpam_readline function reads a line from a file, and returns it
+ * in a NUL-terminated buffer allocated with =malloc.
+ *
+ * The =openpam_readline function performs a certain amount of processing
+ * on the data it reads.
+ * Comments (introduced by a hash sign) are stripped, as is leading and
+ * trailing whitespace.
+ * Any amount of linear whitespace is collapsed to a single space.
+ * Blank lines are ignored.
+ * If a line ends in a backslash, the backslash is stripped and the next
+ * line is appended.
+ *
+ * If =lineno is not =NULL, the integer variable it points to is
+ * incremented every time a newline character is read.
+ *
+ * If =lenp is not =NULL, the length of the line (not including the
+ * terminating NUL character) is stored in the variable it points to.
+ *
+ * The caller is responsible for releasing the returned buffer by passing
+ * it to =free.
+ */