text_cmds/ed/io.c

   1 /* io.c: This file contains the i/o routines for the ed line editor */
   2 /*-
   3  * Copyright (c) 1993 Andrew Moore, Talke Studio.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD: src/bin/ed/io.c,v 1.14 2003/01/01 18:48:39 schweikh Exp $");
  30
  31 #include "ed.h"
  32
  33
  34 extern int scripted;
  35
  36 /* read_file: read a named file/pipe into the buffer; return line count */
  37 long
  38 read_file(char *fn, long n)
  39 {
  40         FILE *fp;
  41         long size;
  42
  43
  44         fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
  45         if (fp == NULL) {
  46                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  47                 errmsg = "cannot open input file";
  48                 return ERR;
  49         } else if ((size = read_stream(fp, n)) < 0)
  50                 return ERR;
  51          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
  52                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  53                 errmsg = "cannot close input file";
  54                 return ERR;
  55         }
  56         fprintf(stdout, !scripted ? "%lu\n" : "", size);
  57         return current_addr - n;
  58 }
  59
  60
  61 extern int des;
  62
  63 char *sbuf;                     /* file i/o buffer */
  64 int sbufsz;                     /* file i/o buffer size */
  65 int newline_added;              /* if set, newline appended to input file */
  66
  67 /* read_stream: read a stream into the editor buffer; return status */
  68 long
  69 read_stream(FILE *fp, long n)
  70 {
  71         line_t *lp = get_addressed_line_node(n);
  72         undo_t *up = NULL;
  73         unsigned long size = 0;
  74         int o_newline_added = newline_added;
  75         int o_isbinary = isbinary;
  76         int appended = (n == addr_last);
  77         int len;
  78
  79         isbinary = newline_added = 0;
  80         if (des)
  81                 init_des_cipher();
  82         for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
  83                 SPL1();
  84                 if (put_sbuf_line(sbuf) == NULL) {
  85                         SPL0();
  86                         return ERR;
  87                 }
  88                 lp = lp->q_forw;
  89                 if (up)
  90                         up->t = lp;
  91                 else if ((up = push_undo_stack(UADD, current_addr,
  92                     current_addr)) == NULL) {
  93                         SPL0();
  94                         return ERR;
  95                 }
  96                 SPL0();
  97         }
  98         if (len < 0)
  99                 return ERR;
 100         if (appended && size && o_isbinary && o_newline_added)
 101                 fputs("newline inserted\n", stderr);
 102         else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
 103                 fputs("newline appended\n", stderr);
 104         if (isbinary && newline_added && !appended)
 105                 size += 1;
 106         if (!size)
 107                 newline_added = 1;
 108         newline_added = appended ? newline_added : o_newline_added;
 109         isbinary = isbinary | o_isbinary;
 110         if (des)
 111                 size += 8 - size % 8;                   /* adjust DES size */
 112         return size;
 113 }
 114
 115
 116 /* get_stream_line: read a line of text from a stream; return line length */
 117 int
 118 get_stream_line(FILE *fp)
 119 {
 120         int c;
 121         int i = 0;
 122
 123         while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
 124             !ferror(fp))) && c != '\n') {
 125                 REALLOC(sbuf, sbufsz, i + 1, ERR);
 126                 if (!(sbuf[i++] = c))
 127                         isbinary = 1;
 128         }
 129         REALLOC(sbuf, sbufsz, i + 2, ERR);
 130         if (c == '\n')
 131                 sbuf[i++] = c;
 132         else if (ferror(fp)) {
 133                 fprintf(stderr, "%s\n", strerror(errno));
 134                 errmsg = "cannot read input file";
 135                 return ERR;
 136         } else if (i) {
 137                 sbuf[i++] = '\n';
 138                 newline_added = 1;
 139         }
 140         sbuf[i] = '\0';
 141         return (isbinary && newline_added && i) ? --i : i;
 142 }
 143
 144
 145 /* write_file: write a range of lines to a named file/pipe; return line count */
 146 long
 147 write_file(char *fn, const char *mode, long n, long m)
 148 {
 149         FILE *fp;
 150         long size;
 151
 152         fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
 153         if (fp == NULL) {
 154                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 155                 errmsg = "cannot open output file";
 156                 return ERR;
 157         } else if ((size = write_stream(fp, n, m)) < 0)
 158                 return ERR;
 159          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
 160                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 161                 errmsg = "cannot close output file";
 162                 return ERR;
 163         }
 164         fprintf(stdout, !scripted ? "%lu\n" : "", size);
 165         return n ? m - n + 1 : 0;
 166 }
 167
 168
 169 /* write_stream: write a range of lines to a stream; return status */
 170 long
 171 write_stream(FILE *fp, long n, long m)
 172 {
 173         line_t *lp = get_addressed_line_node(n);
 174         unsigned long size = 0;
 175         char *s;
 176         int len;
 177
 178         if (des)
 179                 init_des_cipher();
 180         for (; n && n <= m; n++, lp = lp->q_forw) {
 181                 if ((s = get_sbuf_line(lp)) == NULL)
 182                         return ERR;
 183                 len = lp->len;
 184                 if (n != addr_last || !isbinary || !newline_added)
 185                         s[len++] = '\n';
 186                 if (put_stream_line(fp, s, len) < 0)
 187                         return ERR;
 188                 size += len;
 189         }
 190         if (des) {
 191                 flush_des_file(fp);                     /* flush buffer */
 192                 size += 8 - size % 8;                   /* adjust DES size */
 193         }
 194         return size;
 195 }
 196
 197
 198 /* put_stream_line: write a line of text to a stream; return status */
 199 int
 200 put_stream_line(FILE *fp, const char *s, int len)
 201 {
 202         while (len--)
 203                 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
 204                         fprintf(stderr, "%s\n", strerror(errno));
 205                         errmsg = "cannot write file";
 206                         return ERR;
 207                 }
 208         return 0;
 209 }
 210
 211 /* get_extended_line: get an extended line from stdin */
 212 char *
 213 get_extended_line(int *sizep, int nonl)
 214 {
 215         static char *cvbuf = NULL;              /* buffer */
 216         static int cvbufsz = 0;                 /* buffer size */
 217
 218         int l, n;
 219         char *t = ibufp;
 220
 221         while (*t++ != '\n')
 222                 ;
 223         if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
 224                 *sizep = l;
 225                 return ibufp;
 226         }
 227         *sizep = -1;
 228         REALLOC(cvbuf, cvbufsz, l, NULL);
 229         memcpy(cvbuf, ibufp, l);
 230         *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 231         if (nonl) l--;                  /* strip newline */
 232         for (;;) {
 233                 if ((n = get_tty_line()) < 0)
 234                         return NULL;
 235                 else if (n == 0 || ibuf[n - 1] != '\n') {
 236                         errmsg = "unexpected end-of-file";
 237                         return NULL;
 238                 }
 239                 REALLOC(cvbuf, cvbufsz, l + n, NULL);
 240                 memcpy(cvbuf + l, ibuf, n);
 241                 l += n;
 242                 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
 243                         break;
 244                 *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 245                 if (nonl) l--;                  /* strip newline */
 246         }
 247         REALLOC(cvbuf, cvbufsz, l + 1, NULL);
 248         cvbuf[l] = '\0';
 249         *sizep = l;
 250         return cvbuf;
 251 }
 252
 253
 254 /* get_tty_line: read a line of text from stdin; return line length */
 255 int
 256 get_tty_line(void)
 257 {
 258         int oi = 0;
 259         int i = 0;
 260         int c;
 261
 262         for (;;)
 263                 switch (c = getchar()) {
 264                 default:
 265                         oi = 0;
 266                         REALLOC(ibuf, ibufsz, i + 2, ERR);
 267                         if (!(ibuf[i++] = c)) isbinary = 1;
 268                         if (c != '\n')
 269                                 continue;
 270                         lineno++;
 271                         ibuf[i] = '\0';
 272                         ibufp = ibuf;
 273                         return i;
 274                 case EOF:
 275                         if (ferror(stdin)) {
 276                                 fprintf(stderr, "stdin: %s\n", strerror(errno));
 277                                 errmsg = "cannot read stdin";
 278                                 clearerr(stdin);
 279                                 ibufp = NULL;
 280                                 return ERR;
 281                         } else {
 282                                 clearerr(stdin);
 283                                 if (i != oi) {
 284                                         oi = i;
 285                                         continue;
 286                                 } else if (i)
 287                                         ibuf[i] = '\0';
 288                                 ibufp = ibuf;
 289                                 return i;
 290                         }
 291                 }
 292 }
 293
 294
 295
 296 #define ESCAPES "\a\b\f\n\r\t\v\\"
 297 #define ESCCHARS "abfnrtv\\"
 298
 299 extern int rows;
 300 extern int cols;
 301
 302 /* put_tty_line: print text to stdout */
 303 int
 304 put_tty_line(const char *s, int l, long n, int gflag)
 305 {
 306         int col = 0;
 307         char *cp;
 308
 309         if ((gflag & GNP) && !(gflag & GINT)) {
 310                 printf("%ld\t", n);
 311                 col = 8;
 312         }
 313         for (; l--; s++) {
 314                 if ((gflag & GLS) && ++col > cols) {
 315                         fputs("\\\n", stdout);
 316                         col = 1;
 317                 }
 318                 if (gflag & GLS) {
 319                         if (31 < *s && *s < 127 && *s != '\\')
 320                                 putchar(*s);
 321                         else {
 322                                 putchar('\\');
 323                                 col++;
 324                                 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
 325                                         putchar(ESCCHARS[cp - ESCAPES]);
 326                                 else {
 327                                         putchar((((unsigned char) *s & 0300) >> 6) + '0');
 328                                         putchar((((unsigned char) *s & 070) >> 3) + '0');
 329                                         putchar(((unsigned char) *s & 07) + '0');
 330                                         col += 2;
 331                                 }
 332                         }
 333
 334                 } else
 335                         putchar(*s);
 336         }
 337         if (posixly_correct && (gflag & GLS) && !(gflag & GINT))
 338                 putchar('$');
 339         putchar('\n');
 340         return 0;
 341 }