From b7c15c31519dc44c1f691e0466badd556ffe9423 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 18:18:56 +0200
Subject: Adding upstream version 3.7.10.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/util/readlline.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 src/util/readlline.c

(limited to 'src/util/readlline.c')

diff --git a/src/util/readlline.c b/src/util/readlline.c
new file mode 100644
index 0000000..015877a
--- /dev/null
+++ b/src/util/readlline.c
@@ -0,0 +1,138 @@
+/*++
+/* NAME
+/*	readlline 3
+/* SUMMARY
+/*	read logical line
+/* SYNOPSIS
+/*	#include <readlline.h>
+/*
+/*	VSTRING	*readllines(buf, fp, lineno, first_line)
+/*	VSTRING	*buf;
+/*	VSTREAM	*fp;
+/*	int	*lineno;
+/*	int	*first_line;
+/*
+/*	VSTRING	*readlline(buf, fp, lineno)
+/*	VSTRING	*buf;
+/*	VSTREAM	*fp;
+/*	int	*lineno;
+/* DESCRIPTION
+/*	readllines() reads one logical line from the named stream.
+/* .IP "blank lines and comments"
+/*	Empty lines and whitespace-only lines are ignored, as
+/*	are lines whose first non-whitespace character is a `#'.
+/* .IP "multi-line text"
+/*	A logical line starts with non-whitespace text. A line that
+/*	starts with whitespace continues a logical line.
+/* .PP
+/*	The result value is the input buffer argument or a null pointer
+/*	when no input is found.
+/*
+/*	readlline() is a backwards-compatibility wrapper.
+/*
+/*	Arguments:
+/* .IP buf
+/*	A variable-length buffer for input. The result is null terminated.
+/* .IP fp
+/*	Handle to an open stream.
+/* .IP lineno
+/*	A null pointer, or a pointer to an integer that is incremented
+/*	after reading a physical line.
+/* .IP first_line
+/*	A null pointer, or a pointer to an integer that will contain
+/*	the line number of the first non-blank, non-comment line
+/*	in the result logical line.
+/* DIAGNOSTICS
+/*	Warning: a continuation line that does not continue preceding text.
+/*	The invalid input is ignored, to avoid complicating caller code.
+/* SECURITY
+/* .ad
+/* .fi
+/*	readlline() imposes no logical line length limit therefore it
+/*	should be used for reading trusted information only.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "vstream.h"
+#include "vstring.h"
+#include "readlline.h"
+
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+#define END(x) vstring_end(x)
+
+/* readllines - read one logical line */
+
+VSTRING *readllines(VSTRING *buf, VSTREAM *fp, int *lineno, int *first_line)
+{
+    int     ch;
+    int     next;
+    ssize_t start;
+    char   *cp;
+
+    VSTRING_RESET(buf);
+
+    /*
+     * Ignore comment lines, all whitespace lines, and empty lines. Terminate
+     * at EOF or at the beginning of the next logical line.
+     */
+    for (;;) {
+	/* Read one line, possibly not newline terminated. */
+	start = LEN(buf);
+	while ((ch = VSTREAM_GETC(fp)) != VSTREAM_EOF && ch != '\n')
+	    VSTRING_ADDCH(buf, ch);
+	if (lineno != 0 && (ch == '\n' || LEN(buf) > start))
+	    *lineno += 1;
+	/* Ignore comment line, all whitespace line, or empty line. */
+	for (cp = STR(buf) + start; cp < END(buf) && ISSPACE(*cp); cp++)
+	     /* void */ ;
+	if (cp == END(buf) || *cp == '#')
+	    vstring_truncate(buf, start);
+	else if (start == 0 && lineno != 0 && first_line != 0)
+	    *first_line = *lineno;
+	/* Terminate at EOF or at the beginning of the next logical line. */
+	if (ch == VSTREAM_EOF)
+	    break;
+	if (LEN(buf) > 0) {
+	    if ((next = VSTREAM_GETC(fp)) != VSTREAM_EOF)
+		vstream_ungetc(fp, next);
+	    if (next != '#' && !ISSPACE(next))
+		break;
+	}
+    }
+    VSTRING_TERMINATE(buf);
+
+    /*
+     * Invalid input: continuing text without preceding text. Allowing this
+     * would complicate "postconf -e", which implements its own multi-line
+     * parsing routine. Do not abort, just warn, so that critical programs
+     * like postmap do not leave behind a truncated table.
+     */
+    if (LEN(buf) > 0 && ISSPACE(*STR(buf))) {
+	msg_warn("%s: logical line must not start with whitespace: \"%.30s%s\"",
+		 VSTREAM_PATH(fp), STR(buf),
+		 LEN(buf) > 30 ? "..." : "");
+	return (readllines(buf, fp, lineno, first_line));
+    }
+
+    /*
+     * Done.
+     */
+    return (LEN(buf) > 0 ? buf : 0);
+}
-- 
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