bin/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  * @(#)io.c,v 1.1 1994/02/01 00:34:41 alm Exp
  28  * $FreeBSD: src/bin/ed/io.c,v 1.14 2003/01/01 18:48:39 schweikh Exp $
  29  * $DragonFly: src/bin/ed/io.c,v 1.6 2007/04/06 23:36:54 pavalos Exp $
  30  */
  31
  32 #include "ed.h"
  33
  34
  35 extern int scripted;
  36
  37 /* read_file: read a named file/pipe into the buffer; return line count */
  38 long
  39 read_file(char *fn, long n)
  40 {
  41         FILE *fp;
  42         long size;
  43
  44
  45         fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
  46         if (fp == NULL) {
  47                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  48                 errmsg = "cannot open input file";
  49                 return ERR;
  50         } else if ((size = read_stream(fp, n)) < 0)
  51                 return ERR;
  52          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
  53                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  54                 errmsg = "cannot close input file";
  55                 return ERR;
  56         }
  57         fprintf(stdout, !scripted ? "%lu\n" : "", size);
  58         return current_addr - n;
  59 }
  60
  61
  62 extern int des;
  63
  64 char *sbuf;                     /* file i/o buffer */
  65 int sbufsz;                     /* file i/o buffer size */
  66 int newline_added;              /* if set, newline appended to input file */
  67
  68 /* read_stream: read a stream into the editor buffer; return status */
  69 long
  70 read_stream(FILE *fp, long n)
  71 {
  72         line_t *lp = get_addressed_line_node(n);
  73         undo_t *up = NULL;
  74         unsigned long size = 0;
  75         int o_newline_added = newline_added;
  76         int o_isbinary = isbinary;
  77         int appended = (n == addr_last);
  78         int len;
  79
  80         isbinary = newline_added = 0;
  81         if (des)
  82                 init_des_cipher();
  83         for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
  84                 SPL1();
  85                 if (put_sbuf_line(sbuf) == NULL) {
  86                         SPL0();
  87                         return ERR;
  88                 }
  89                 lp = lp->q_forw;
  90                 if (up)
  91                         up->t = lp;
  92                 else if ((up = push_undo_stack(UADD, current_addr,
  93                     current_addr)) == NULL) {
  94                         SPL0();
  95                         return ERR;
  96                 }
  97                 SPL0();
  98         }
  99         if (len < 0)
 100                 return ERR;
 101         if (appended && size && o_isbinary && o_newline_added)
 102                 fputs("newline inserted\n", stderr);
 103         else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
 104                 fputs("newline appended\n", stderr);
 105         if (isbinary && newline_added && !appended)
 106                 size += 1;
 107         if (!size)
 108                 newline_added = 1;
 109         newline_added = appended ? newline_added : o_newline_added;
 110         isbinary = isbinary | o_isbinary;
 111         if (des)
 112                 size += 8 - size % 8;                   /* adjust DES size */
 113         return size;
 114 }
 115
 116
 117 /* get_stream_line: read a line of text from a stream; return line length */
 118 int
 119 get_stream_line(FILE *fp)
 120 {
 121         int c;
 122         int i = 0;
 123
 124         while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
 125             !ferror(fp))) && c != '\n') {
 126                 REALLOC(sbuf, sbufsz, i + 1, ERR);
 127                 if (!(sbuf[i++] = c))
 128                         isbinary = 1;
 129         }
 130         REALLOC(sbuf, sbufsz, i + 2, ERR);
 131         if (c == '\n')
 132                 sbuf[i++] = c;
 133         else if (ferror(fp)) {
 134                 fprintf(stderr, "%s\n", strerror(errno));
 135                 errmsg = "cannot read input file";
 136                 return ERR;
 137         } else if (i) {
 138                 sbuf[i++] = '\n';
 139                 newline_added = 1;
 140         }
 141         sbuf[i] = '\0';
 142         return (isbinary && newline_added && i) ? --i : i;
 143 }
 144
 145
 146 /* write_file: write a range of lines to a named file/pipe; return line count */
 147 long
 148 write_file(const char *fn, const char *mode, long n, long m)
 149 {
 150         FILE *fp;
 151         long size;
 152
 153         fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
 154         if (fp == NULL) {
 155                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 156                 errmsg = "cannot open output file";
 157                 return ERR;
 158         } else if ((size = write_stream(fp, n, m)) < 0)
 159                 return ERR;
 160          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
 161                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 162                 errmsg = "cannot close output file";
 163                 return ERR;
 164         }
 165         fprintf(stdout, !scripted ? "%lu\n" : "", size);
 166         return n ? m - n + 1 : 0;
 167 }
 168
 169
 170 /* write_stream: write a range of lines to a stream; return status */
 171 long
 172 write_stream(FILE *fp, long n, long m)
 173 {
 174         line_t *lp = get_addressed_line_node(n);
 175         unsigned long size = 0;
 176         char *s;
 177         int len;
 178
 179         if (des)
 180                 init_des_cipher();
 181         for (; n && n <= m; n++, lp = lp->q_forw) {
 182                 if ((s = get_sbuf_line(lp)) == NULL)
 183                         return ERR;
 184                 len = lp->len;
 185                 if (n != addr_last || !isbinary || !newline_added)
 186                         s[len++] = '\n';
 187                 if (put_stream_line(fp, s, len) < 0)
 188                         return ERR;
 189                 size += len;
 190         }
 191         if (des) {
 192                 flush_des_file(fp);                     /* flush buffer */
 193                 size += 8 - size % 8;                   /* adjust DES size */
 194         }
 195         return size;
 196 }
 197
 198
 199 /* put_stream_line: write a line of text to a stream; return status */
 200 int
 201 put_stream_line(FILE *fp, const char *s, int len)
 202 {
 203         while (len--)
 204                 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
 205                         fprintf(stderr, "%s\n", strerror(errno));
 206                         errmsg = "cannot write file";
 207                         return ERR;
 208                 }
 209         return 0;
 210 }
 211
 212 /* get_extended_line: get an extended line from stdin */
 213 char *
 214 get_extended_line(int *sizep, int nonl)
 215 {
 216         static char *cvbuf = NULL;              /* buffer */
 217         static int cvbufsz = 0;                 /* buffer size */
 218
 219         int l, n;
 220         char *t = ibufp;
 221
 222         while (*t++ != '\n')
 223                 ;
 224         if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
 225                 *sizep = l;
 226                 return ibufp;
 227         }
 228         *sizep = -1;
 229         REALLOC(cvbuf, cvbufsz, l, NULL);
 230         memcpy(cvbuf, ibufp, l);
 231         *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 232         if (nonl) l--;                  /* strip newline */
 233         for (;;) {
 234                 if ((n = get_tty_line()) < 0)
 235                         return NULL;
 236                 else if (n == 0 || ibuf[n - 1] != '\n') {
 237                         errmsg = "unexpected end-of-file";
 238                         return NULL;
 239                 }
 240                 REALLOC(cvbuf, cvbufsz, l + n, NULL);
 241                 memcpy(cvbuf + l, ibuf, n);
 242                 l += n;
 243                 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
 244                         break;
 245                 *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 246                 if (nonl) l--;                  /* strip newline */
 247         }
 248         REALLOC(cvbuf, cvbufsz, l + 1, NULL);
 249         cvbuf[l] = '\0';
 250         *sizep = l;
 251         return cvbuf;
 252 }
 253
 254
 255 /* get_tty_line: read a line of text from stdin; return line length */
 256 int
 257 get_tty_line(void)
 258 {
 259         int oi = 0;
 260         int i = 0;
 261         int c;
 262
 263         for (;;)
 264                 switch (c = getchar()) {
 265                 default:
 266                         oi = 0;
 267                         REALLOC(ibuf, ibufsz, i + 2, ERR);
 268                         if (!(ibuf[i++] = c)) isbinary = 1;
 269                         if (c != '\n')
 270                                 continue;
 271                         lineno++;
 272                         ibuf[i] = '\0';
 273                         ibufp = ibuf;
 274                         return i;
 275                 case EOF:
 276                         if (ferror(stdin)) {
 277                                 fprintf(stderr, "stdin: %s\n", strerror(errno));
 278                                 errmsg = "cannot read stdin";
 279                                 clearerr(stdin);
 280                                 ibufp = NULL;
 281                                 return ERR;
 282                         } else {
 283                                 clearerr(stdin);
 284                                 if (i != oi) {
 285                                         oi = i;
 286                                         continue;
 287                                 } else if (i)
 288                                         ibuf[i] = '\0';
 289                                 ibufp = ibuf;
 290                                 return i;
 291                         }
 292                 }
 293 }
 294
 295
 296
 297 #define ESCAPES "\a\b\f\n\r\t\v\\"
 298 #define ESCCHARS "abfnrtv\\"
 299
 300 extern int rows;
 301 extern int cols;
 302
 303 /* put_tty_line: print text to stdout */
 304 int
 305 put_tty_line(const char *s, int l, long n, int gflag)
 306 {
 307         int col = 0;
 308         int lc = 0;
 309         char *cp;
 310
 311         if (gflag & GNP) {
 312                 printf("%ld\t", n);
 313                 col = 8;
 314         }
 315         for (; l--; s++) {
 316                 if ((gflag & GLS) && ++col > cols) {
 317                         fputs("\\\n", stdout);
 318                         col = 1;
 319 #ifndef BACKWARDS
 320                         if (!scripted && !isglobal && ++lc > rows) {
 321                                 lc = 0;
 322                                 fputs("Press <RETURN> to continue... ", stdout);
 323                                 fflush(stdout);
 324                                 if (get_tty_line() < 0)
 325                                         return ERR;
 326                         }
 327 #endif
 328                 }
 329                 if (gflag & GLS) {
 330                         if (31 < *s && *s < 127 && *s != '\\')
 331                                 putchar(*s);
 332                         else {
 333                                 putchar('\\');
 334                                 col++;
 335                                 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
 336                                         putchar(ESCCHARS[cp - ESCAPES]);
 337                                 else {
 338                                         putchar((((unsigned char) *s & 0300) >> 6) + '0');
 339                                         putchar((((unsigned char) *s & 070) >> 3) + '0');
 340                                         putchar(((unsigned char) *s & 07) + '0');
 341                                         col += 2;
 342                                 }
 343                         }
 344
 345                 } else
 346                         putchar(*s);
 347         }
 348 #ifndef BACKWARDS
 349         if (gflag & GLS)
 350                 putchar('$');
 351 #endif
 352         putchar('\n');
 353         return 0;
 354 }