io.c revision 1.1
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 #ifndef lint 29 static char *rcsid = "@(#)io.c,v 1.1 1994/02/01 00:34:41 alm Exp"; 30 #endif /* not lint */ 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(fn, n) 40 char *fn; 41 long n; 42 { 43 FILE *fp; 44 long size; 45 46 47 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r"); 48 if (fp == NULL) { 49 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 50 sprintf(errmsg, "cannot open input file"); 51 return ERR; 52 } else if ((size = read_stream(fp, n)) < 0) 53 return ERR; 54 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { 55 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 56 sprintf(errmsg, "cannot close input file"); 57 return ERR; 58 } 59 fprintf(stderr, !scripted ? "%lu\n" : "", size); 60 return current_addr - n; 61 } 62 63 64 extern int des; 65 66 char *sbuf; /* file i/o buffer */ 67 int sbufsz; /* file i/o buffer size */ 68 int newline_added; /* if set, newline appended to input file */ 69 70 /* read_stream: read a stream into the editor buffer; return status */ 71 long 72 read_stream(fp, n) 73 FILE *fp; 74 long n; 75 { 76 line_t *lp = get_addressed_line_node(n); 77 undo_t *up = NULL; 78 unsigned long size = 0; 79 int o_newline_added = newline_added; 80 int o_isbinary = isbinary; 81 int appended = (n == addr_last); 82 int len; 83 84 isbinary = newline_added = 0; 85 if (des) 86 init_des_cipher(); 87 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) { 88 SPL1(); 89 if (put_sbuf_line(sbuf) == NULL) { 90 SPL0(); 91 return ERR; 92 } 93 lp = lp->q_forw; 94 if (up) 95 up->t = lp; 96 else if ((up = push_undo_stack(UADD, current_addr, 97 current_addr)) == NULL) { 98 SPL0(); 99 return ERR; 100 } 101 SPL0(); 102 } 103 if (len < 0) 104 return ERR; 105 if (appended && size && o_isbinary && o_newline_added) 106 fputs("newline inserted\n", stderr); 107 else if (newline_added && (!appended || !isbinary && !o_isbinary)) 108 fputs("newline appended\n", stderr); 109 if (isbinary && newline_added && !appended) 110 size += 1; 111 if (!size) 112 newline_added = 1; 113 newline_added = appended ? newline_added : o_newline_added; 114 isbinary = isbinary | o_isbinary; 115 if (des) 116 size += 8 - size % 8; /* adjust DES size */ 117 return size; 118 } 119 120 121 /* get_stream_line: read a line of text from a stream; return line length */ 122 int 123 get_stream_line(fp) 124 FILE *fp; 125 { 126 register int c; 127 register int i = 0; 128 129 while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || !feof(fp) && 130 !ferror(fp)) && c != '\n') { 131 REALLOC(sbuf, sbufsz, i + 1, ERR); 132 if (!(sbuf[i++] = c)) 133 isbinary = 1; 134 } 135 REALLOC(sbuf, sbufsz, i + 2, ERR); 136 if (c == '\n') 137 sbuf[i++] = c; 138 else if (ferror(fp)) { 139 fprintf(stderr, "%s\n", strerror(errno)); 140 sprintf(errmsg, "cannot read input file"); 141 return ERR; 142 } else if (i) { 143 sbuf[i++] = '\n'; 144 newline_added = 1; 145 } 146 sbuf[i] = '\0'; 147 return (isbinary && newline_added && i) ? --i : i; 148 } 149 150 151 /* write_file: write a range of lines to a named file/pipe; return line count */ 152 long 153 write_file(fn, mode, n, m) 154 char *fn; 155 char *mode; 156 long n; 157 long m; 158 { 159 FILE *fp; 160 long size; 161 162 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode); 163 if (fp == NULL) { 164 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 165 sprintf(errmsg, "cannot open output file"); 166 return ERR; 167 } else if ((size = write_stream(fp, n, m)) < 0) 168 return ERR; 169 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { 170 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 171 sprintf(errmsg, "cannot close output file"); 172 return ERR; 173 } 174 fprintf(stderr, !scripted ? "%lu\n" : "", size); 175 return n ? m - n + 1 : 0; 176 } 177 178 179 /* write_stream: write a range of lines to a stream; return status */ 180 long 181 write_stream(fp, n, m) 182 FILE *fp; 183 long n; 184 long m; 185 { 186 line_t *lp = get_addressed_line_node(n); 187 unsigned long size = 0; 188 char *s; 189 int len; 190 191 if (des) 192 init_des_cipher(); 193 for (; n && n <= m; n++, lp = lp->q_forw) { 194 if ((s = get_sbuf_line(lp)) == NULL) 195 return ERR; 196 len = lp->len; 197 if (n != addr_last || !isbinary || !newline_added) 198 s[len++] = '\n'; 199 if (put_stream_line(fp, s, len) < 0) 200 return ERR; 201 size += len; 202 } 203 if (des) { 204 flush_des_file(fp); /* flush buffer */ 205 size += 8 - size % 8; /* adjust DES size */ 206 } 207 return size; 208 } 209 210 211 /* put_stream_line: write a line of text to a stream; return status */ 212 int 213 put_stream_line(fp, s, len) 214 FILE *fp; 215 char *s; 216 int len; 217 { 218 while (len--) 219 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) { 220 fprintf(stderr, "%s\n", strerror(errno)); 221 sprintf(errmsg, "cannot write file"); 222 return ERR; 223 } 224 return 0; 225 } 226 227 /* get_extended_line: get a an extended line from stdin */ 228 char * 229 get_extended_line(sizep, nonl) 230 int *sizep; 231 int nonl; 232 { 233 static char *cvbuf = NULL; /* buffer */ 234 static int cvbufsz = 0; /* buffer size */ 235 236 int l, n; 237 char *t = ibufp; 238 239 while (*t++ != '\n') 240 ; 241 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) { 242 *sizep = l; 243 return ibufp; 244 } 245 *sizep = -1; 246 REALLOC(cvbuf, cvbufsz, l, NULL); 247 memcpy(cvbuf, ibufp, l); 248 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 249 if (nonl) l--; /* strip newline */ 250 for (;;) { 251 if ((n = get_tty_line()) < 0) 252 return NULL; 253 else if (n == 0 || ibuf[n - 1] != '\n') { 254 sprintf(errmsg, "unexpected end-of-file"); 255 return NULL; 256 } 257 REALLOC(cvbuf, cvbufsz, l + n, NULL); 258 memcpy(cvbuf + l, ibuf, n); 259 l += n; 260 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1)) 261 break; 262 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 263 if (nonl) l--; /* strip newline */ 264 } 265 REALLOC(cvbuf, cvbufsz, l + 1, NULL); 266 cvbuf[l] = '\0'; 267 *sizep = l; 268 return cvbuf; 269 } 270 271 272 /* get_tty_line: read a line of text from stdin; return line length */ 273 int 274 get_tty_line() 275 { 276 register int oi = 0; 277 register int i = 0; 278 int c; 279 280 for (;;) 281 switch (c = getchar()) { 282 default: 283 oi = 0; 284 REALLOC(ibuf, ibufsz, i + 2, ERR); 285 if (!(ibuf[i++] = c)) isbinary = 1; 286 if (c != '\n') 287 continue; 288 lineno++; 289 ibuf[i] = '\0'; 290 ibufp = ibuf; 291 return i; 292 case EOF: 293 if (ferror(stdin)) { 294 fprintf(stderr, "stdin: %s\n", strerror(errno)); 295 sprintf(errmsg, "cannot read stdin"); 296 clearerr(stdin); 297 ibufp = NULL; 298 return ERR; 299 } else { 300 clearerr(stdin); 301 if (i != oi) { 302 oi = i; 303 continue; 304 } else if (i) 305 ibuf[i] = '\0'; 306 ibufp = ibuf; 307 return i; 308 } 309 } 310 } 311 312 313 314 #define ESCAPES "\a\b\f\n\r\t\v\\" 315 #define ESCCHARS "abfnrtv\\" 316 317 extern int rows; 318 extern int cols; 319 320 /* put_tty_line: print text to stdout */ 321 int 322 put_tty_line(s, l, n, gflag) 323 char *s; 324 int l; 325 long n; 326 int gflag; 327 { 328 int col = 0; 329 int lc = 0; 330 char *cp; 331 332 if (gflag & GNP) { 333 printf("%ld\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 } 376
Indexes created Tue Sep 23 02:09:52 GMT 2025