bin/ed/io.c

   1 /*      $NetBSD: io.c,v 1.7 2005/02/17 16:29:26 xtraeme Exp $   */
   2
   3 /* io.c: This file contains the i/o routines for the ed line editor */
   4 /*-
   5  * Copyright (c) 1993 Andrew Moore, Talke Studio.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #ifndef lint
  32 #if 0
  33 static char *rcsid = "@(#)io.c,v 1.1 1994/02/01 00:34:41 alm Exp";
  34 #else
  35 __RCSID("$NetBSD: io.c,v 1.7 2005/02/17 16:29:26 xtraeme Exp $");
  36 #endif
  37 #endif /* not lint */
  38
  39 #include "ed.h"
  40
  41
  42 /* read_file: read a named file/pipe into the buffer; return line count */
  43 long
  44 read_file(char *fn, long n)
  45 {
  46         FILE *fp;
  47         long size;
  48
  49
  50         fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
  51         if (fp == NULL) {
  52                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  53                 sprintf(errmsg, "cannot open input file");
  54                 return ERR;
  55         } else if ((size = read_stream(fp, n)) < 0)
  56                 return ERR;
  57          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
  58                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  59                 sprintf(errmsg, "cannot close input file");
  60                 return ERR;
  61         }
  62         fprintf(stderr, !scripted ? "%lu\n" : "", size);
  63         return current_addr - n;
  64 }
  65
  66
  67 char *sbuf;                     /* file i/o buffer */
  68 int sbufsz;                     /* file i/o buffer size */
  69 int newline_added;              /* if set, newline appended to input file */
  70
  71 /* read_stream: read a stream into the editor buffer; return status */
  72 long
  73 read_stream(FILE *fp, long n)
  74 {
  75         line_t *lp = get_addressed_line_node(n);
  76         undo_t *up = NULL;
  77         unsigned long size = 0;
  78         int o_newline_added = newline_added;
  79         int o_isbinary = isbinary;
  80         int appended = (n == addr_last);
  81         int len;
  82
  83         isbinary = newline_added = 0;
  84         if (des)
  85                 init_des_cipher();
  86         for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
  87                 SPL1();
  88                 if (put_sbuf_line(sbuf) == NULL) {
  89                         SPL0();
  90                         return ERR;
  91                 }
  92                 lp = lp->q_forw;
  93                 if (up)
  94                         up->t = lp;
  95                 else if ((up = push_undo_stack(UADD, current_addr,
  96                     current_addr)) == NULL) {
  97                         SPL0();
  98                         return ERR;
  99                 }
 100                 SPL0();
 101         }
 102         if (len < 0)
 103                 return ERR;
 104         if (appended && size && o_isbinary && o_newline_added)
 105                 fputs("newline inserted\n", stderr);
 106         else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
 107                 fputs("newline appended\n", stderr);
 108         if (isbinary && newline_added && !appended)
 109                 size += 1;
 110         if (!size)
 111                 newline_added = 1;
 112         newline_added = appended ? newline_added : o_newline_added;
 113         isbinary = isbinary | o_isbinary;
 114         if (des)
 115                 size += 8 - size % 8;                   /* adjust DES size */
 116         return size;
 117 }
 118
 119
 120 /* get_stream_line: read a line of text from a stream; return line length */
 121 int
 122 get_stream_line(FILE *fp)
 123 {
 124         int c;
 125         int i = 0;
 126
 127         while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
 128             !ferror(fp))) && c != '\n') {
 129                 REALLOC(sbuf, sbufsz, i + 1, ERR);
 130                 if (!(sbuf[i++] = c))
 131                         isbinary = 1;
 132         }
 133         REALLOC(sbuf, sbufsz, i + 2, ERR);
 134         if (c == '\n')
 135                 sbuf[i++] = c;
 136         else if (ferror(fp)) {
 137                 fprintf(stderr, "%s\n", strerror(errno));
 138                 sprintf(errmsg, "cannot read input file");
 139                 return ERR;
 140         } else if (i) {
 141                 sbuf[i++] = '\n';
 142                 newline_added = 1;
 143         }
 144         sbuf[i] = '\0';
 145         return (isbinary && newline_added && i) ? --i : i;
 146 }
 147
 148
 149 /* write_file: write a range of lines to a named file/pipe; return line count */
 150 long
 151 write_file(const char *fn, const char *mode, long n, long m)
 152 {
 153         FILE *fp;
 154         long size;
 155
 156         fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode);
 157         if (fp == NULL) {
 158                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 159                 sprintf(errmsg, "cannot open output file");
 160                 return ERR;
 161         } else if ((size = write_stream(fp, n, m)) < 0)
 162                 return ERR;
 163          else if (((*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
 164                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 165                 sprintf(errmsg, "cannot close output file");
 166                 return ERR;
 167         }
 168         fprintf(stderr, !scripted ? "%lu\n" : "", size);
 169         return n ? m - n + 1 : 0;
 170 }
 171
 172
 173 /* write_stream: write a range of lines to a stream; return status */
 174 long
 175 write_stream(FILE *fp, long n, long m)
 176 {
 177         line_t *lp = get_addressed_line_node(n);
 178         unsigned long size = 0;
 179         char *s;
 180         int len;
 181
 182         if (des)
 183                 init_des_cipher();
 184         for (; n && n <= m; n++, lp = lp->q_forw) {
 185                 if ((s = get_sbuf_line(lp)) == NULL)
 186                         return ERR;
 187                 len = lp->len;
 188                 if (n != addr_last || !isbinary || !newline_added)
 189                         s[len++] = '\n';
 190                 if (put_stream_line(fp, s, len) < 0)
 191                         return ERR;
 192                 size += len;
 193         }
 194         if (des) {
 195                 flush_des_file(fp);                     /* flush buffer */
 196                 size += 8 - size % 8;                   /* adjust DES size */
 197         }
 198         return size;
 199 }
 200
 201
 202 /* put_stream_line: write a line of text to a stream; return status */
 203 int
 204 put_stream_line(FILE *fp, char *s, int len)
 205 {
 206         while (len--)
 207                 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
 208                         fprintf(stderr, "%s\n", strerror(errno));
 209                         sprintf(errmsg, "cannot write file");
 210                         return ERR;
 211                 }
 212         return 0;
 213 }
 214
 215 /* get_extended_line: get a an extended line from stdin */
 216 char *
 217 get_extended_line(int *sizep, int nonl)
 218 {
 219         static char *cvbuf = NULL;              /* buffer */
 220         static int cvbufsz = 0;                 /* buffer size */
 221
 222         int l, n;
 223         char *t = ibufp;
 224
 225         while (*t++ != '\n')
 226                 ;
 227         if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
 228                 *sizep = l;
 229                 return ibufp;
 230         }
 231         *sizep = -1;
 232         REALLOC(cvbuf, cvbufsz, l, NULL);
 233         memcpy(cvbuf, ibufp, l);
 234         *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 235         if (nonl) l--;                  /* strip newline */
 236         for (;;) {
 237                 if ((n = get_tty_line()) < 0)
 238                         return NULL;
 239                 else if (n == 0 || ibuf[n - 1] != '\n') {
 240                         sprintf(errmsg, "unexpected end-of-file");
 241                         return NULL;
 242                 }
 243                 REALLOC(cvbuf, cvbufsz, l + n, NULL);
 244                 memcpy(cvbuf + l, ibuf, n);
 245                 l += n;
 246                 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
 247                         break;
 248                 *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 249                 if (nonl) l--;                  /* strip newline */
 250         }
 251         REALLOC(cvbuf, cvbufsz, l + 1, NULL);
 252         cvbuf[l] = '\0';
 253         *sizep = l;
 254         return cvbuf;
 255 }
 256
 257
 258 /* get_tty_line: read a line of text from stdin; return line length */
 259 int
 260 get_tty_line(void)
 261 {
 262         int oi = 0;
 263         int i = 0;
 264         int c;
 265
 266         for (;;)
 267                 switch (c = getchar()) {
 268                 default:
 269                         oi = 0;
 270                         REALLOC(ibuf, ibufsz, i + 2, ERR);
 271                         if (!(ibuf[i++] = c)) isbinary = 1;
 272                         if (c != '\n')
 273                                 continue;
 274                         lineno++;
 275                         ibuf[i] = '\0';
 276                         ibufp = ibuf;
 277                         return i;
 278                 case EOF:
 279                         if (ferror(stdin)) {
 280                                 fprintf(stderr, "stdin: %s\n", strerror(errno));
 281                                 sprintf(errmsg, "cannot read stdin");
 282                                 clearerr(stdin);
 283                                 ibufp = NULL;
 284                                 return ERR;
 285                         } else {
 286                                 clearerr(stdin);
 287                                 if (i != oi) {
 288                                         oi = i;
 289                                         continue;
 290                                 } else if (i)
 291                                         ibuf[i] = '\0';
 292                                 ibufp = ibuf;
 293                                 return i;
 294                         }
 295                 }
 296 }
 297
 298
 299
 300 #define ESCAPES "\a\b\f\n\r\t\v\\"
 301 #define ESCCHARS "abfnrtv\\"
 302
 303 /* put_tty_line: print text to stdout */
 304 int
 305 put_tty_line(char *s, int l, long n, int gflag)
 306 {
 307         int col = 0;
 308         char *cp;
 309 #ifndef BACKWARDS
 310         int lc = 0;
 311 #endif
 312
 313         if (gflag & GNP) {
 314                 printf("%ld\t", n);
 315                 col = 8;
 316         }
 317         for (; l--; s++) {
 318                 if ((gflag & GLS) && ++col > cols) {
 319                         fputs("\\\n", stdout);
 320                         col = 1;
 321 #ifndef BACKWARDS
 322                         if (!scripted && !isglobal && ++lc > rows) {
 323                                 lc = 0;
 324                                 fputs("Press <RETURN> to continue... ", stdout);
 325                                 fflush(stdout);
 326                                 if (get_tty_line() < 0)
 327                                         return ERR;
 328                         }
 329 #endif
 330                 }
 331                 if (gflag & GLS) {
 332                         if (31 < *s && *s < 127 && *s != '\\')
 333                                 putchar(*s);
 334                         else {
 335                                 putchar('\\');
 336                                 col++;
 337                                 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
 338                                         putchar(ESCCHARS[cp - ESCAPES]);
 339                                 else {
 340                                         putchar((((unsigned char) *s & 0300) >> 6) + '0');
 341                                         putchar((((unsigned char) *s & 070) >> 3) + '0');
 342                                         putchar(((unsigned char) *s & 07) + '0');
 343                                         col += 2;
 344                                 }
 345                         }
 346
 347                 } else
 348                         putchar(*s);
 349         }
 350 #ifndef BACKWARDS
 351         if (gflag & GLS)
 352                 putchar('$');
 353 #endif
 354         putchar('\n');
 355         return 0;
 356 }