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/*
* iop.c - do i/o related things.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Progamming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "awk.h"
#ifndef atarist
#define INVALID_HANDLE (-1)
#else
#include <stddef.h>
#include <fcntl.h>
#define INVALID_HANDLE (__SMALLEST_VALID_HANDLE - 1)
#endif /* atarist */
#ifdef TEST
int bufsize = 8192;
#endif
int
optimal_bufsize(fd)
int fd;
{
#ifdef VMS
/* don't even bother trying [fstat() fails across DECnet] */
return BUFSIZ;
#else
struct stat stb;
/*
* System V doesn't have the file system block size in the
* stat structure. So we have to make some sort of reasonable
* guess. We use stdio's BUFSIZ, since that is what it was
* meant for in the first place.
*/
#ifdef BLKSIZE_MISSING
#define DEFBLKSIZE BUFSIZ
#else
#define DEFBLKSIZE (stb.st_blksize ? stb.st_blksize : BUFSIZ)
#endif
#ifdef TEST
return bufsize;
#endif
#ifndef atarist
if (isatty(fd))
#else
/*
* On ST redirected stdin does not have a name attached
* (this could be hard to do to) and fstat would fail
*/
if (0 == fd || isatty(fd))
#endif /*atarist */
return BUFSIZ;
if (fstat(fd, &stb) == -1)
fatal("can't stat fd %d (%s)", fd, strerror(errno));
if (lseek(fd, 0L, 0) == -1)
return DEFBLKSIZE;
return (stb.st_size < DEFBLKSIZE ? stb.st_size : DEFBLKSIZE);
#endif /*! VMS */
}
IOBUF *
iop_alloc(fd)
int fd;
{
IOBUF *iop;
if (fd == INVALID_HANDLE)
return NULL;
emalloc(iop, IOBUF *, sizeof(IOBUF), "iop_alloc");
iop->flag = 0;
if (isatty(fd))
iop->flag |= IOP_IS_TTY;
iop->size = optimal_bufsize(fd);
errno = 0;
iop->fd = fd;
emalloc(iop->buf, char *, iop->size + 2, "iop_alloc");
iop->end = iop->off = iop->buf;
iop->secsiz = iop->size < BUFSIZ ? iop->size : BUFSIZ;
emalloc(iop->secbuf, char *, iop->secsiz+2, "iop_alloc");
iop->cnt = -1;
return iop;
}
int
get_a_record(out, iop, rs)
char **out;
IOBUF *iop;
register int rs;
{
register char *bp = iop->off;
register char *end_data = iop->end; /* end of current data read */
char *end_buf = iop->buf + iop->size; /* end of input buffer */
char *start = iop->off; /* beginning of record */
char *offset = iop->secbuf; /* end of data in secbuf */
size_t size;
if (iop->cnt == 0)
return EOF;
/* set up sentinels */
if (rs == 0) {
*end_data = *(end_data+1) = '\n';
*end_buf = *(end_buf+1) = '\n';
} else
*end_data = *end_buf = rs;
for (;;) { /* break on end of record, read error or EOF */
if (bp == end_data) {
if (bp == end_buf) { /* record spans buffer end */
#ifdef atarist
#define P_DIFF ptrdiff_t
#else
#define P_DIFF int
#endif
#define COPY_TO_SECBUF { \
P_DIFF oldlen = offset - iop->secbuf; \
P_DIFF newlen = bp - start; \
\
if (iop->secsiz < oldlen + newlen) { \
erealloc(iop->secbuf, char *, \
oldlen+newlen, "get_record"); \
offset = iop->secbuf + oldlen; \
} \
memcpy(offset, start, newlen); \
offset += newlen; \
}
COPY_TO_SECBUF
start = bp = iop->buf;
size = iop->size;
} else
size = end_buf - bp;
iop->cnt = read(iop->fd, bp, size);
if (iop->cnt == -1)
fatal("error reading input");
else if (iop->cnt == 0) {
break;
} else {
end_data = bp + iop->cnt;
if (rs == 0 && *bp == '\n'
&& offset > iop->secbuf
&& *(offset-1) == '\n') {
bp++;
break;
}
if (rs == 0) {
*end_data = *(end_data+1) = '\n';
*end_buf = *(end_buf+1) = '\n';
} else
*end_data = rs;
}
}
if (rs == 0) {
for (;;) {
if (*bp++ == '\n' && *bp == '\n') {
bp++;
break;
}
}
} else
while (*bp++ != rs)
;
if (bp <= end_data) /* end of record */
break;
bp = end_data;
}
if (offset == iop->secbuf && start == bp && iop->cnt == 0) {
*out = start;
return EOF;
}
iop->off = bp;
iop->end = end_data;
if (offset != iop->secbuf) {
if (start != bp)
COPY_TO_SECBUF
start = iop->secbuf;
bp = offset;
}
if (rs == 0) {
if (*--bp == '\n') {
*bp = '\0';
if (*--bp == '\n')
*bp = '\0';
else
bp++;
} else
bp++;
} else if (*--bp == rs)
;
else
bp++;
*bp = '\0';
*out = start;
return bp - start;
}
#ifdef TEST
main(argc, argv)
int argc;
char *argv[];
{
IOBUF *iop;
char *out;
int cnt;
if (argc > 1)
bufsize = atoi(argv[1]);
iop = iop_alloc(0);
while ((cnt = get_a_record(&out, iop, 0)) > 0) {
fwrite(out, 1, cnt, stdout);
fwrite("\n", 1, 1, stdout);
}
}
#endif
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