bin/ed/io.c

   1 /*      $OpenBSD: io.c,v 1.15 2009/10/28 15:40:47 deraadt Exp $ */
   2 /*      $NetBSD: io.c,v 1.2 1995/03/21 09:04:43 cgd Exp $       */
   3
   4 /* io.c: This file contains the i/o routines for the ed line editor */
   5 /*-
   6  * Copyright (c) 1993 Andrew Moore, Talke Studio.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  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 int
  38 read_file(char *fn, int n)
  39 {
  40         FILE *fp;
  41         int size;
  42
  43
  44         fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
  45         if (fp == NULL) {
  46                 perror(fn);
  47                 seterrmsg("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                 perror(fn);
  53                 seterrmsg("cannot close input file");
  54                 return ERR;
  55         }
  56         fprintf(stderr, !scripted ? "%d\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 int
  69 read_stream(FILE *fp, int n)
  70 {
  71         line_t *lp = get_addressed_line_node(n);
  72         undo_t *up = NULL;
  73         unsigned int 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 #ifdef DES
  81         if (des)
  82                 init_des_cipher();
  83 #endif
  84         for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
  85                 SPL1();
  86                 if (put_sbuf_line(sbuf) == NULL) {
  87                         SPL0();
  88                         return ERR;
  89                 }
  90                 lp = lp->q_forw;
  91                 if (up)
  92                         up->t = lp;
  93                 else if ((up = push_undo_stack(UADD, current_addr,
  94                     current_addr)) == NULL) {
  95                         SPL0();
  96                         return ERR;
  97                 }
  98                 SPL0();
  99         }
 100         if (len < 0)
 101                 return ERR;
 102         if (appended && size && o_isbinary && o_newline_added)
 103                 fputs("newline inserted\n", stderr);
 104         else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
 105                 fputs("newline appended\n", stderr);
 106         if (isbinary && newline_added && !appended)
 107                 size += 1;
 108         if (!size)
 109                 newline_added = 1;
 110         newline_added = appended ? newline_added : o_newline_added;
 111         isbinary = isbinary | o_isbinary;
 112         if (des)
 113                 size += 8 - size % 8;                   /* adjust DES size */
 114         return size;
 115 }
 116
 117 #ifdef DES
 118 #define DESGETCHAR(fp) (des ? get_des_char((fp)) : getc((fp)))
 119 #else
 120 #define DESGETCHAR(fp) (getc((fp)))
 121 #endif
 122
 123 /* get_stream_line: read a line of text from a stream; return line length */
 124 int
 125 get_stream_line(FILE *fp)
 126 {
 127         int c;
 128         int i = 0;
 129
 130         while (((c = DESGETCHAR(fp)) != EOF || (!feof(fp) &&
 131             !ferror(fp))) && c != '\n') {
 132                 REALLOC(sbuf, sbufsz, i + 1, ERR);
 133                 if (!(sbuf[i++] = c))
 134                         isbinary = 1;
 135         }
 136         REALLOC(sbuf, sbufsz, i + 2, ERR);
 137         if (c == '\n')
 138                 sbuf[i++] = c;
 139         else if (ferror(fp)) {
 140                 perror(NULL);
 141                 seterrmsg("cannot read input file");
 142                 return ERR;
 143         } else if (i) {
 144                 sbuf[i++] = '\n';
 145                 newline_added = 1;
 146         }
 147         sbuf[i] = '\0';
 148         return (isbinary && newline_added && i) ? --i : i;
 149 }
 150
 151
 152 /* write_file: write a range of lines to a named file/pipe; return line count */
 153 int
 154 write_file(char *fn, char *mode, int n, int m)
 155 {
 156         FILE *fp;
 157         int size;
 158
 159         fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
 160         if (fp == NULL) {
 161                 perror(fn);
 162                 seterrmsg("cannot open output file");
 163                 return ERR;
 164         } else if ((size = write_stream(fp, n, m)) < 0)
 165                 return ERR;
 166          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
 167                 perror(fn);
 168                 seterrmsg("cannot close output file");
 169                 return ERR;
 170         }
 171         fprintf(stderr, !scripted ? "%d\n" : "", size);
 172         return n ? m - n + 1 : 0;
 173 }
 174
 175
 176 /* write_stream: write a range of lines to a stream; return status */
 177 int
 178 write_stream(FILE *fp, int n, int m)
 179 {
 180         line_t *lp = get_addressed_line_node(n);
 181         unsigned int size = 0;
 182         char *s;
 183         int len;
 184
 185 #ifdef DES
 186         if (des)
 187                 init_des_cipher();
 188 #endif
 189         for (; n && n <= m; n++, lp = lp->q_forw) {
 190                 if ((s = get_sbuf_line(lp)) == NULL)
 191                         return ERR;
 192                 len = lp->len;
 193                 if (n != addr_last || !isbinary || !newline_added)
 194                         s[len++] = '\n';
 195                 if (put_stream_line(fp, s, len) < 0)
 196                         return ERR;
 197                 size += len;
 198         }
 199 #ifdef DES
 200         if (des) {
 201                 flush_des_file(fp);                     /* flush buffer */
 202                 size += 8 - size % 8;                   /* adjust DES size */
 203         }
 204 #endif
 205         return size;
 206 }
 207
 208 #ifdef DES
 209 #define DESPUTCHAR(c, fp) (des ? put_des_char((c), (fp)) : fputc((c), (fp)))
 210 #else
 211 #define DESPUTCHAR(c, fp) (fputc((c), (fp)))
 212 #endif
 213
 214
 215 /* put_stream_line: write a line of text to a stream; return status */
 216 int
 217 put_stream_line(FILE *fp, char *s, int len)
 218 {
 219         while (len--) {
 220                 if (DESPUTCHAR(*s, fp) < 0) {
 221                         perror(NULL);
 222                         seterrmsg("cannot write file");
 223                         return ERR;
 224                 }
 225                 s++;
 226         }
 227         return 0;
 228 }
 229
 230 /* get_extended_line: get a an extended line from stdin */
 231 char *
 232 get_extended_line(int *sizep, int nonl)
 233 {
 234         static char *cvbuf = NULL;              /* buffer */
 235         static int cvbufsz = 0;                 /* buffer size */
 236
 237         int l, n;
 238         char *t = ibufp;
 239
 240         while (*t++ != '\n')
 241                 ;
 242         if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
 243                 *sizep = l;
 244                 return ibufp;
 245         }
 246         *sizep = -1;
 247         REALLOC(cvbuf, cvbufsz, l, NULL);
 248         memcpy(cvbuf, ibufp, l);
 249         *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 250         if (nonl)
 251                 l--;                    /* strip newline */
 252         for (;;) {
 253                 if ((n = get_tty_line()) < 0)
 254                         return NULL;
 255                 else if (n == 0 || ibuf[n - 1] != '\n') {
 256                         seterrmsg("unexpected end-of-file");
 257                         return NULL;
 258                 }
 259                 REALLOC(cvbuf, cvbufsz, l + n, NULL);
 260                 memcpy(cvbuf + l, ibuf, n);
 261                 l += n;
 262                 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
 263                         break;
 264                 *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 265                 if (nonl) l--;                  /* strip newline */
 266         }
 267         REALLOC(cvbuf, cvbufsz, l + 1, NULL);
 268         cvbuf[l] = '\0';
 269         *sizep = l;
 270         return cvbuf;
 271 }
 272
 273
 274 /* get_tty_line: read a line of text from stdin; return line length */
 275 int
 276 get_tty_line(void)
 277 {
 278         int oi = 0;
 279         int i = 0;
 280         int c;
 281
 282         for (;;)
 283                 switch (c = getchar()) {
 284                 default:
 285                         oi = 0;
 286                         REALLOC(ibuf, ibufsz, i + 2, ERR);
 287                         if (!(ibuf[i++] = c)) isbinary = 1;
 288                         if (c != '\n')
 289                                 continue;
 290                         lineno++;
 291                         ibuf[i] = '\0';
 292                         ibufp = ibuf;
 293                         return i;
 294                 case EOF:
 295                         if (ferror(stdin)) {
 296                                 perror("stdin");
 297                                 seterrmsg("cannot read stdin");
 298                                 clearerr(stdin);
 299                                 ibufp = NULL;
 300                                 return ERR;
 301                         } else {
 302                                 clearerr(stdin);
 303                                 if (i != oi) {
 304                                         oi = i;
 305                                         continue;
 306                                 } else if (i)
 307                                         ibuf[i] = '\0';
 308                                 ibufp = ibuf;
 309                                 return i;
 310                         }
 311                 }
 312 }
 313
 314
 315
 316 #define ESCAPES "\a\b\f\n\r\t\v\\"
 317 #define ESCCHARS "abfnrtv\\"
 318
 319 extern int rows;
 320 extern int cols;
 321
 322 /* put_tty_line: print text to stdout */
 323 int
 324 put_tty_line(char *s, int l, int n, int gflag)
 325 {
 326         int col = 0;
 327 #ifndef BACKWARDS
 328         int lc = 0;
 329 #endif
 330         char *cp;
 331
 332         if (gflag & GNP) {
 333                 printf("%d\t", n);
 334                 col = 8;
 335         }
 336         for (; l--; s++) {
 337                 if ((gflag & GLS) && ++col > cols) {
 338                         fputs("\\\n", stdout);
 339                         col = 1;
 340 #ifndef BACKWARDS
 341                         if (!scripted && !isglobal && ++lc > rows) {
 342                                 lc = 0;
 343                                 fputs("Press <RETURN> to continue... ", stdout);
 344                                 fflush(stdout);
 345                                 if (get_tty_line() < 0)
 346                                         return ERR;
 347                         }
 348 #endif
 349                 }
 350                 if (gflag & GLS) {
 351                         if (31 < *s && *s < 127 && *s != '\\')
 352                                 putchar(*s);
 353                         else {
 354                                 putchar('\\');
 355                                 col++;
 356                                 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
 357                                         putchar(ESCCHARS[cp - ESCAPES]);
 358                                 else {
 359                                         putchar((((unsigned char) *s & 0300) >> 6) + '0');
 360                                         putchar((((unsigned char) *s & 070) >> 3) + '0');
 361                                         putchar(((unsigned char) *s & 07) + '0');
 362                                         col += 2;
 363                                 }
 364                         }
 365
 366                 } else
 367                         putchar(*s);
 368         }
 369 #ifndef BACKWARDS
 370         if (gflag & GLS)
 371                 putchar('$');
 372 #endif
 373         putchar('\n');
 374         return 0;
 375 }