107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
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/*++
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/* NAME
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/* rec_streamlf 3
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/* SUMMARY
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/* record interface to stream-lf files
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/* SYNOPSIS
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/* #include <rec_streamlf.h>
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/*
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/* int rec_streamlf_get(stream, buf, maxlen)
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/* VSTREAM *stream;
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/* VSTRING *buf;
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/* int maxlen;
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/*
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/* int rec_streamlf_put(stream, type, data, len)
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/* VSTREAM *stream;
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/* int type;
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/* const char *data;
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/* int len;
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/* AUXILIARY FUNCTIONS
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/* int REC_STREAMLF_PUT_BUF(stream, type, buf)
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/* VSTREAM *stream;
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/* int type;
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/* VSTRING *buf;
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/* DESCRIPTION
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/* This module implements record I/O on top of stream-lf files.
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/*
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/* rec_streamlf_get() reads one record from the specified stream.
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/* The result is not null-terminated and may contain embedded null
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/* characters.
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/* The \fImaxlen\fR argument specifies an upper bound to the amount
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/* of data read. The result is REC_TYPE_NORM when the record was
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/* terminated by newline, REC_TYPE_CONT when no terminating newline
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/* was found (the record was larger than \fImaxlen\fR characters or
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/* EOF was reached), and REC_TYPE_EOF when no data could be read or
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/* when an I/O error was detected.
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/*
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/* rec_streamlf_put() writes one record to the named stream.
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/* When the record type is REC_TYPE_NORM, a newline character is
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/* appended to the output. The result is the record type, or
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/* REC_TYPE_EOF in case of problems.
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/*
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/* REC_STREAMLF_PUT_BUF() is a wrapper for rec_streamlf_put() that
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/* makes it more convenient to output VSTRING buffers.
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/* REC_STREAMLF_PUT_BUF() is an unsafe macro that evaluates some
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/* arguments more than once.
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/* SEE ALSO
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/* record(3) typed records
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include <sys_defs.h>
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/* Utility library. */
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#include <vstring.h>
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#include <vstream.h>
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/* Global library. */
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#include <record.h>
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#include <rec_type.h>
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#include <rec_streamlf.h>
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/* rec_streamlf_get - read record from stream-lf file */
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int rec_streamlf_get(VSTREAM *stream, VSTRING *buf, int maxlen)
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{
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int n = maxlen;
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int ch;
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/*
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* If this one character ar a time code proves to be a performance
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* bottleneck, switch to block search (memchr()) and to block move
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* (memcpy()) operations.
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*/
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VSTRING_RESET(buf);
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while (n-- > 0) {
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if ((ch = VSTREAM_GETC(stream)) == VSTREAM_EOF)
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return (VSTRING_LEN(buf) > 0 ? REC_TYPE_CONT : REC_TYPE_EOF);
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if (ch == '\n')
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return (REC_TYPE_NORM);
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VSTRING_ADDCH(buf, ch);
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}
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return (REC_TYPE_CONT);
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}
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/* rec_streamlf_put - write record to stream-lf file */
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int rec_streamlf_put(VSTREAM *stream, int type, const char *data, int len)
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{
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if (len > 0)
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(void) vstream_fwrite(stream, data, len);
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if (type == REC_TYPE_NORM)
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(void) VSTREAM_PUTC('\n', stream);
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return (vstream_ferror(stream) ? REC_TYPE_EOF : type);
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}
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