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/*++
/* NAME
/* postconf_print 3
/* SUMMARY
/* basic line printing support
/* SYNOPSIS
/* #include <postconf.h>
/*
/* void pcf_print_line(fp, mode, const char *fmt, ...)
/* VSTREAM *fp;
/* int mode;
/* const char *fmt;
/* DESCRIPTION
/* pcf_print_line() formats text, normalized whitespace, and
/* optionally folds long lines.
/*
/* Arguments:
/* .IP fp
/* Output stream.
/* .IP mode
/* Bit-wise OR of zero or more of the following (other flags
/* are ignored):
/* .RS
/* .IP PCF_FOLD_LINE
/* Fold long lines.
/* .RE
/* .IP fmt
/* Format string.
/* DIAGNOSTICS
/* Problems are reported to the standard error stream.
/* 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 <string.h>
#include <stdarg.h>
/* Utility library. */
#include <msg.h>
#include <vstream.h>
#include <vstring.h>
/* Application-specific. */
#include <postconf.h>
/* SLMs. */
#define STR(x) vstring_str(x)
/* pcf_print_line - show line possibly folded, and with normalized whitespace */
void pcf_print_line(VSTREAM *fp, int mode, const char *fmt,...)
{
va_list ap;
static VSTRING *buf = 0;
char *start;
char *next;
int line_len = 0;
int word_len;
/*
* One-off initialization.
*/
if (buf == 0)
buf = vstring_alloc(100);
/*
* Format the text.
*/
va_start(ap, fmt);
vstring_vsprintf(buf, fmt, ap);
va_end(ap);
/*
* Normalize the whitespace. We don't use the line_wrap() routine because
* 1) that function does not normalize whitespace between words and 2) we
* want to normalize whitespace even when not wrapping lines.
*
* XXX Some parameters preserve whitespace: for example, smtpd_banner and
* smtpd_reject_footer. If we have to preserve whitespace between words,
* then perhaps readlline() can be changed to canonicalize whitespace
* that follows a newline.
*/
for (start = STR(buf); *(start += strspn(start, PCF_SEPARATORS)) != 0; start = next) {
word_len = strcspn(start, PCF_SEPARATORS);
if (*(next = start + word_len) != 0)
*next++ = 0;
if (word_len > 0 && line_len > 0) {
if ((mode & PCF_FOLD_LINE) == 0
|| line_len + word_len < PCF_LINE_LIMIT) {
vstream_fputs(" ", fp);
line_len += 1;
} else {
vstream_fputs("\n" PCF_INDENT_TEXT, fp);
line_len = PCF_INDENT_LEN;
}
}
vstream_fputs(start, fp);
line_len += word_len;
}
vstream_fputs("\n", fp);
}
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