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344 lines
8.3 KiB
C
344 lines
8.3 KiB
C
/* io.c: This file contains the i/o routines for the ed line editor */
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/*-
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* Copyright (c) 1993 Andrew Moore, Talke Studio.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include "ed.h"
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/* read_file: read a named file/pipe into the buffer; return line count */
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long
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read_file(char *fn, long n)
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{
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FILE *fp;
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long size;
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int cs;
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fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
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if (fp == NULL) {
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fprintf(stderr, "%s: %s\n", fn, strerror(errno));
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errmsg = "cannot open input file";
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return ERR;
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}
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if ((size = read_stream(fp, n)) < 0) {
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fprintf(stderr, "%s: %s\n", fn, strerror(errno));
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errmsg = "error reading input file";
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}
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if ((cs = (*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
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fprintf(stderr, "%s: %s\n", fn, strerror(errno));
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errmsg = "cannot close input file";
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}
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if (size < 0 || cs < 0)
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return ERR;
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if (!scripted)
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fprintf(stdout, "%lu\n", size);
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return current_addr - n;
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}
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static char *sbuf; /* file i/o buffer */
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static int sbufsz; /* file i/o buffer size */
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int newline_added; /* if set, newline appended to input file */
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/* read_stream: read a stream into the editor buffer; return status */
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long
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read_stream(FILE *fp, long n)
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{
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line_t *lp = get_addressed_line_node(n);
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undo_t *up = NULL;
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unsigned long size = 0;
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int o_newline_added = newline_added;
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int o_isbinary = isbinary;
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int appended = (n == addr_last);
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int len;
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isbinary = newline_added = 0;
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for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
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SPL1();
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if (put_sbuf_line(sbuf) == NULL) {
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SPL0();
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return ERR;
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}
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lp = lp->q_forw;
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if (up)
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up->t = lp;
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else if ((up = push_undo_stack(UADD, current_addr,
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current_addr)) == NULL) {
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SPL0();
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return ERR;
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}
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SPL0();
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}
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if (len < 0)
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return ERR;
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if (appended && size && o_isbinary && o_newline_added)
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fputs("newline inserted\n", stderr);
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else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
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fputs("newline appended\n", stderr);
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if (isbinary && newline_added && !appended)
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size += 1;
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if (!size)
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newline_added = 1;
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newline_added = appended ? newline_added : o_newline_added;
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isbinary = isbinary | o_isbinary;
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return size;
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}
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/* get_stream_line: read a line of text from a stream; return line length */
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int
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get_stream_line(FILE *fp)
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{
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int c;
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int i = 0;
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while (((c = getc(fp)) != EOF || (!feof(fp) && !ferror(fp))) &&
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c != '\n') {
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REALLOC(sbuf, sbufsz, i + 1, ERR);
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if (!(sbuf[i++] = c))
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isbinary = 1;
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}
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REALLOC(sbuf, sbufsz, i + 2, ERR);
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if (c == '\n')
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sbuf[i++] = c;
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else if (ferror(fp)) {
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fprintf(stderr, "%s\n", strerror(errno));
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errmsg = "cannot read input file";
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return ERR;
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} else if (i) {
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sbuf[i++] = '\n';
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newline_added = 1;
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}
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sbuf[i] = '\0';
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return (isbinary && newline_added && i) ? --i : i;
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}
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/* write_file: write a range of lines to a named file/pipe; return line count */
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long
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write_file(char *fn, const char *mode, long n, long m)
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{
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FILE *fp;
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long size;
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int cs;
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fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
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if (fp == NULL) {
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fprintf(stderr, "%s: %s\n", fn, strerror(errno));
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errmsg = "cannot open output file";
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return ERR;
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}
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if ((size = write_stream(fp, n, m)) < 0) {
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fprintf(stderr, "%s: %s\n", fn, strerror(errno));
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errmsg = "error writing output file";
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}
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if ((cs = (*fn == '!') ? pclose(fp) : fclose(fp)) < 0) {
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fprintf(stderr, "%s: %s\n", fn, strerror(errno));
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errmsg = "cannot close output file";
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}
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if (size < 0 || cs < 0)
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return ERR;
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if (!scripted)
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fprintf(stdout, "%lu\n", size);
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return n ? m - n + 1 : 0;
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}
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/* write_stream: write a range of lines to a stream; return status */
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long
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write_stream(FILE *fp, long n, long m)
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{
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line_t *lp = get_addressed_line_node(n);
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unsigned long size = 0;
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char *s;
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int len;
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for (; n && n <= m; n++, lp = lp->q_forw) {
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if ((s = get_sbuf_line(lp)) == NULL)
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return ERR;
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len = lp->len;
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if (n != addr_last || !isbinary || !newline_added)
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s[len++] = '\n';
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if (put_stream_line(fp, s, len) < 0)
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return ERR;
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size += len;
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}
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return size;
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}
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/* put_stream_line: write a line of text to a stream; return status */
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int
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put_stream_line(FILE *fp, const char *s, int len)
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{
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while (len--)
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if (fputc(*s++, fp) < 0) {
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fprintf(stderr, "%s\n", strerror(errno));
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errmsg = "cannot write file";
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return ERR;
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}
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return 0;
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}
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/* get_extended_line: get an extended line from stdin */
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char *
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get_extended_line(int *sizep, int nonl)
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{
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static char *cvbuf = NULL; /* buffer */
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static int cvbufsz = 0; /* buffer size */
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int l, n;
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char *t = ibufp;
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while (*t++ != '\n')
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;
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if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
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*sizep = l;
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return ibufp;
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}
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*sizep = -1;
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REALLOC(cvbuf, cvbufsz, l, NULL);
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memcpy(cvbuf, ibufp, l);
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*(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
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if (nonl) l--; /* strip newline */
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for (;;) {
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if ((n = get_tty_line()) < 0)
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return NULL;
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else if (n == 0 || ibuf[n - 1] != '\n') {
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errmsg = "unexpected end-of-file";
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return NULL;
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}
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REALLOC(cvbuf, cvbufsz, l + n, NULL);
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memcpy(cvbuf + l, ibuf, n);
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l += n;
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if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
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break;
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*(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
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if (nonl) l--; /* strip newline */
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}
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REALLOC(cvbuf, cvbufsz, l + 1, NULL);
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cvbuf[l] = '\0';
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*sizep = l;
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return cvbuf;
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}
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/* get_tty_line: read a line of text from stdin; return line length */
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int
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get_tty_line(void)
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{
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int oi = 0;
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int i = 0;
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int c;
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for (;;)
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switch (c = getchar()) {
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default:
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oi = 0;
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REALLOC(ibuf, ibufsz, i + 2, ERR);
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if (!(ibuf[i++] = c)) isbinary = 1;
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if (c != '\n')
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continue;
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lineno++;
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ibuf[i] = '\0';
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ibufp = ibuf;
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return i;
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case EOF:
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if (ferror(stdin)) {
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fprintf(stderr, "stdin: %s\n", strerror(errno));
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errmsg = "cannot read stdin";
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clearerr(stdin);
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ibufp = NULL;
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return ERR;
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} else {
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clearerr(stdin);
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if (i != oi) {
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oi = i;
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continue;
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} else if (i)
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ibuf[i] = '\0';
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ibufp = ibuf;
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return i;
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}
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}
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}
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#define ESCAPES "\a\b\f\n\r\t\v\\"
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#define ESCCHARS "abfnrtv\\"
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/* put_tty_line: print text to stdout */
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int
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put_tty_line(const char *s, int l, long n, int gflag)
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{
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int col = 0;
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int lc = 0;
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char *cp;
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if (gflag & GNP) {
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printf("%ld\t", n);
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col = 8;
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}
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for (; l--; s++) {
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if ((gflag & GLS) && ++col > cols) {
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fputs("\\\n", stdout);
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col = 1;
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#ifndef BACKWARDS
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if (!scripted && !isglobal && ++lc > rows) {
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lc = 0;
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fputs("Press <RETURN> to continue... ", stdout);
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fflush(stdout);
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if (get_tty_line() < 0)
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return ERR;
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}
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#endif
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}
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if (gflag & GLS) {
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if (31 < *s && *s < 127 && *s != '\\')
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putchar(*s);
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else {
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putchar('\\');
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col++;
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if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
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putchar(ESCCHARS[cp - ESCAPES]);
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else {
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putchar((((unsigned char) *s & 0300) >> 6) + '0');
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putchar((((unsigned char) *s & 070) >> 3) + '0');
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putchar(((unsigned char) *s & 07) + '0');
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col += 2;
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}
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}
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} else
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putchar(*s);
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}
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#ifndef BACKWARDS
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if (gflag & GLS)
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putchar('$');
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#endif
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putchar('\n');
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return 0;
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}
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