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/*++
/* 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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