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