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-rw-r--r--src/global/rec_streamlf.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/global/rec_streamlf.c b/src/global/rec_streamlf.c
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+/*++
+/* NAME
+/* rec_streamlf 3
+/* SUMMARY
+/* record interface to stream-lf files
+/* SYNOPSIS
+/* #include <rec_streamlf.h>
+/*
+/* int rec_streamlf_get(stream, buf, maxlen)
+/* VSTREAM *stream;
+/* VSTRING *buf;
+/* int maxlen;
+/*
+/* int rec_streamlf_put(stream, type, data, len)
+/* VSTREAM *stream;
+/* int type;
+/* const char *data;
+/* int len;
+/* AUXILIARY FUNCTIONS
+/* int REC_STREAMLF_PUT_BUF(stream, type, buf)
+/* VSTREAM *stream;
+/* int type;
+/* VSTRING *buf;
+/* DESCRIPTION
+/* This module implements record I/O on top of stream-lf files.
+/*
+/* rec_streamlf_get() reads one record from the specified stream.
+/* The result is null-terminated and may contain embedded null
+/* characters.
+/* The \fImaxlen\fR argument specifies an upper bound to the amount
+/* of data read. The result is REC_TYPE_NORM when the record was
+/* terminated by newline, REC_TYPE_CONT when no terminating newline
+/* was found (the record was larger than \fImaxlen\fR characters or
+/* EOF was reached), and REC_TYPE_EOF when no data could be read or
+/* when an I/O error was detected.
+/*
+/* rec_streamlf_put() writes one record to the named stream.
+/* When the record type is REC_TYPE_NORM, a newline character is
+/* appended to the output. The result is the record type, or
+/* REC_TYPE_EOF in case of problems.
+/*
+/* REC_STREAMLF_PUT_BUF() is a wrapper for rec_streamlf_put() that
+/* makes it more convenient to output VSTRING buffers.
+/* REC_STREAMLF_PUT_BUF() is an unsafe macro that evaluates some
+/* arguments more than once.
+/* SEE ALSO
+/* record(3) typed records
+/* 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>
+
+/* Utility library. */
+
+#include <vstring.h>
+#include <vstream.h>
+
+/* Global library. */
+
+#include <record.h>
+#include <rec_type.h>
+#include <rec_streamlf.h>
+
+/* rec_streamlf_get - read record from stream-lf file */
+
+int rec_streamlf_get(VSTREAM *stream, VSTRING *buf, int maxlen)
+{
+ int n = maxlen;
+ int ch;
+
+ /*
+ * If this one character ar a time code proves to be a performance
+ * bottleneck, switch to block search (memchr()) and to block move
+ * (memcpy()) operations.
+ */
+ VSTRING_RESET(buf);
+ while (n-- > 0) {
+ if ((ch = VSTREAM_GETC(stream)) == VSTREAM_EOF)
+ return (VSTRING_LEN(buf) > 0 ? REC_TYPE_CONT : REC_TYPE_EOF);
+ if (ch == '\n') {
+ VSTRING_TERMINATE(buf);
+ return (REC_TYPE_NORM);
+ }
+ VSTRING_ADDCH(buf, ch);
+ }
+ VSTRING_TERMINATE(buf);
+ return (REC_TYPE_CONT);
+}
+
+/* rec_streamlf_put - write record to stream-lf file */
+
+int rec_streamlf_put(VSTREAM *stream, int type, const char *data, int len)
+{
+ if (len > 0)
+ (void) vstream_fwrite(stream, data, len);
+ if (type == REC_TYPE_NORM)
+ (void) VSTREAM_PUTC('\n', stream);
+ return (vstream_ferror(stream) ? REC_TYPE_EOF : type);
+}