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: head/bin/ed/io.c 300692 2016-05-25 18:38:30Z truckman $
  29  */
  30
  31 #include "ed.h"
  32
  33 /* read_file: read a named file/pipe into the buffer; return line count */
  34 long
  35 read_file(char *fn, long n)
  36 {
  37         FILE *fp;
  38         long size;
  39         int cs;
  40
  41         fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r");
  42         if (fp == NULL) {
  43                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  44                 errmsg = "cannot open input file";
  45                 return ERR;
  46         }
  47         if ((size = read_stream(fp, n)) < 0) {
  48                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  49                 errmsg = "error reading input file";
  50         }
  51         if ((cs = (*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
  52                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
  53                 errmsg = "cannot close input file";
  54         }
  55         if (size < 0 || cs < 0)
  56                 return ERR;
  57         if (!scripted)
  58                 fprintf(stdout, "%lu\n", size);
  59         return current_addr - n;
  60 }
  61
  62 static char *sbuf;              /* file i/o buffer */
  63 static int sbufsz;              /* file i/o buffer size */
  64 int newline_added;              /* if set, newline appended to input file */
  65
  66 /* read_stream: read a stream into the editor buffer; return status */
  67 long
  68 read_stream(FILE *fp, long n)
  69 {
  70         line_t *lp = get_addressed_line_node(n);
  71         undo_t *up = NULL;
  72         unsigned long size = 0;
  73         int o_newline_added = newline_added;
  74         int o_isbinary = isbinary;
  75         int appended = (n == addr_last);
  76         int len;
  77
  78         isbinary = newline_added = 0;
  79         if (des)
  80                 init_des_cipher();
  81         for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) {
  82                 SPL1();
  83                 if (put_sbuf_line(sbuf) == NULL) {
  84                         SPL0();
  85                         return ERR;
  86                 }
  87                 lp = lp->q_forw;
  88                 if (up)
  89                         up->t = lp;
  90                 else if ((up = push_undo_stack(UADD, current_addr,
  91                     current_addr)) == NULL) {
  92                         SPL0();
  93                         return ERR;
  94                 }
  95                 SPL0();
  96         }
  97         if (len < 0)
  98                 return ERR;
  99         if (appended && size && o_isbinary && o_newline_added)
 100                 fputs("newline inserted\n", stderr);
 101         else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
 102                 fputs("newline appended\n", stderr);
 103         if (isbinary && newline_added && !appended)
 104                 size += 1;
 105         if (!size)
 106                 newline_added = 1;
 107         newline_added = appended ? newline_added : o_newline_added;
 108         isbinary = isbinary | o_isbinary;
 109         if (des)
 110                 size += 8 - size % 8;                   /* adjust DES size */
 111         return size;
 112 }
 113
 114
 115 /* get_stream_line: read a line of text from a stream; return line length */
 116 int
 117 get_stream_line(FILE *fp)
 118 {
 119         int c;
 120         int i = 0;
 121
 122         while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) &&
 123             !ferror(fp))) && c != '\n') {
 124                 REALLOC(sbuf, sbufsz, i + 1, ERR);
 125                 if (!(sbuf[i++] = c))
 126                         isbinary = 1;
 127         }
 128         REALLOC(sbuf, sbufsz, i + 2, ERR);
 129         if (c == '\n')
 130                 sbuf[i++] = c;
 131         else if (ferror(fp)) {
 132                 fprintf(stderr, "%s\n", strerror(errno));
 133                 errmsg = "cannot read input file";
 134                 return ERR;
 135         } else if (i) {
 136                 sbuf[i++] = '\n';
 137                 newline_added = 1;
 138         }
 139         sbuf[i] = '\0';
 140         return (isbinary && newline_added && i) ? --i : i;
 141 }
 142
 143
 144 /* write_file: write a range of lines to a named file/pipe; return line count */
 145 long
 146 write_file(char *fn, const char *mode, long n, long m)
 147 {
 148         FILE *fp;
 149         long size;
 150         int cs;
 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         }
 158         if ((size = write_stream(fp, n, m)) < 0) {
 159                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 160                 errmsg = "error writing output file";
 161         }
 162         if ((cs = (*fn == '!') ?  pclose(fp) : fclose(fp)) < 0) {
 163                 fprintf(stderr, "%s: %s\n", fn, strerror(errno));
 164                 errmsg = "cannot close output file";
 165         }
 166         if (size < 0 || cs < 0)
 167                 return ERR;
 168         if (!scripted)
 169                 fprintf(stdout, "%lu\n", size);
 170         return n ? m - n + 1 : 0;
 171 }
 172
 173
 174 /* write_stream: write a range of lines to a stream; return status */
 175 long
 176 write_stream(FILE *fp, long n, long m)
 177 {
 178         line_t *lp = get_addressed_line_node(n);
 179         unsigned long size = 0;
 180         char *s;
 181         int len;
 182
 183         if (des)
 184                 init_des_cipher();
 185         for (; n && n <= m; n++, lp = lp->q_forw) {
 186                 if ((s = get_sbuf_line(lp)) == NULL)
 187                         return ERR;
 188                 len = lp->len;
 189                 if (n != addr_last || !isbinary || !newline_added)
 190                         s[len++] = '\n';
 191                 if (put_stream_line(fp, s, len) < 0)
 192                         return ERR;
 193                 size += len;
 194         }
 195         if (des) {
 196                 flush_des_file(fp);                     /* flush buffer */
 197                 size += 8 - size % 8;                   /* adjust DES size */
 198         }
 199         return size;
 200 }
 201
 202
 203 /* put_stream_line: write a line of text to a stream; return status */
 204 int
 205 put_stream_line(FILE *fp, const char *s, int len)
 206 {
 207         while (len--)
 208                 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) {
 209                         fprintf(stderr, "%s\n", strerror(errno));
 210                         errmsg = "cannot write file";
 211                         return ERR;
 212                 }
 213         return 0;
 214 }
 215
 216 /* get_extended_line: get an extended line from stdin */
 217 char *
 218 get_extended_line(int *sizep, int nonl)
 219 {
 220         static char *cvbuf = NULL;              /* buffer */
 221         static int cvbufsz = 0;                 /* buffer size */
 222
 223         int l, n;
 224         char *t = ibufp;
 225
 226         while (*t++ != '\n')
 227                 ;
 228         if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) {
 229                 *sizep = l;
 230                 return ibufp;
 231         }
 232         *sizep = -1;
 233         REALLOC(cvbuf, cvbufsz, l, NULL);
 234         memcpy(cvbuf, ibufp, l);
 235         *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 236         if (nonl) l--;                  /* strip newline */
 237         for (;;) {
 238                 if ((n = get_tty_line()) < 0)
 239                         return NULL;
 240                 else if (n == 0 || ibuf[n - 1] != '\n') {
 241                         errmsg = "unexpected end-of-file";
 242                         return NULL;
 243                 }
 244                 REALLOC(cvbuf, cvbufsz, l + n, NULL);
 245                 memcpy(cvbuf + l, ibuf, n);
 246                 l += n;
 247                 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1))
 248                         break;
 249                 *(cvbuf + --l - 1) = '\n';      /* strip trailing esc */
 250                 if (nonl) l--;                  /* strip newline */
 251         }
 252         REALLOC(cvbuf, cvbufsz, l + 1, NULL);
 253         cvbuf[l] = '\0';
 254         *sizep = l;
 255         return cvbuf;
 256 }
 257
 258
 259 /* get_tty_line: read a line of text from stdin; return line length */
 260 int
 261 get_tty_line(void)
 262 {
 263         int oi = 0;
 264         int i = 0;
 265         int c;
 266
 267         for (;;)
 268                 switch (c = getchar()) {
 269                 default:
 270                         oi = 0;
 271                         REALLOC(ibuf, ibufsz, i + 2, ERR);
 272                         if (!(ibuf[i++] = c)) isbinary = 1;
 273                         if (c != '\n')
 274                                 continue;
 275                         lineno++;
 276                         ibuf[i] = '\0';
 277                         ibufp = ibuf;
 278                         return i;
 279                 case EOF:
 280                         if (ferror(stdin)) {
 281                                 fprintf(stderr, "stdin: %s\n", strerror(errno));
 282                                 errmsg = "cannot read stdin";
 283                                 clearerr(stdin);
 284                                 ibufp = NULL;
 285                                 return ERR;
 286                         } else {
 287                                 clearerr(stdin);
 288                                 if (i != oi) {
 289                                         oi = i;
 290                                         continue;
 291                                 } else if (i)
 292                                         ibuf[i] = '\0';
 293                                 ibufp = ibuf;
 294                                 return i;
 295                         }
 296                 }
 297 }
 298
 299
 300
 301 #define ESCAPES "\a\b\f\n\r\t\v\\"
 302 #define ESCCHARS "abfnrtv\\"
 303
 304 /* put_tty_line: print text to stdout */
 305 int
 306 put_tty_line(const char *s, int l, long n, int gflag)
 307 {
 308         int col = 0;
 309         int lc = 0;
 310         char *cp;
 311
 312         if (gflag & GNP) {
 313                 printf("%ld\t", n);
 314                 col = 8;
 315         }
 316         for (; l--; s++) {
 317                 if ((gflag & GLS) && ++col > cols) {
 318                         fputs("\\\n", stdout);
 319                         col = 1;
 320 #ifndef BACKWARDS
 321                         if (!scripted && !isglobal && ++lc > rows) {
 322                                 lc = 0;
 323                                 fputs("Press <RETURN> to continue... ", stdout);
 324                                 fflush(stdout);
 325                                 if (get_tty_line() < 0)
 326                                         return ERR;
 327                         }
 328 #endif
 329                 }
 330                 if (gflag & GLS) {
 331                         if (31 < *s && *s < 127 && *s != '\\')
 332                                 putchar(*s);
 333                         else {
 334                                 putchar('\\');
 335                                 col++;
 336                                 if (*s && (cp = strchr(ESCAPES, *s)) != NULL)
 337                                         putchar(ESCCHARS[cp - ESCAPES]);
 338                                 else {
 339                                         putchar((((unsigned char) *s & 0300) >> 6) + '0');
 340                                         putchar((((unsigned char) *s & 070) >> 3) + '0');
 341                                         putchar(((unsigned char) *s & 07) + '0');
 342                                         col += 2;
 343                                 }
 344                         }
 345
 346                 } else
 347                         putchar(*s);
 348         }
 349 #ifndef BACKWARDS
 350         if (gflag & GLS)
 351                 putchar('$');
 352 #endif
 353         putchar('\n');
 354         return 0;
 355 }