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-rw-r--r--src/postconf/postconf_print.c114
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diff --git a/src/postconf/postconf_print.c b/src/postconf/postconf_print.c
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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);
+}