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 const char rcsid[] = 30 "$FreeBSD$"; 31 #endif /* not lint */ 32 33 #include "ed.h" 34 35 36 extern int scripted; 37 38 /* read_file: read a named file/pipe into the buffer; return line count */ 39 long 40 read_file(char *fn, long n) 41 { 42 FILE *fp; 43 long size; 44 45 46 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r"); 47 if (fp == NULL) { 48 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 49 errmsg = "cannot open input file"; 50 return ERR; 51 } else if ((size = read_stream(fp, n)) < 0) 52 return ERR; 53 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { 54 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 55 errmsg = "cannot close input file"; 56 return ERR; 57 } 58 fprintf(stdout, !scripted ? "%lu\n" : "", size); 59 return current_addr - n; 60 } 61 62 63 extern int des; 64 65 char *sbuf; /* file i/o buffer */ 66 int sbufsz; /* file i/o buffer size */ 67 int newline_added; /* if set, newline appended to input file */ 68 69 /* read_stream: read a stream into the editor buffer; return status */ 70 long 71 read_stream(FILE *fp, long n) 72 { 73 line_t *lp = get_addressed_line_node(n); 74 undo_t *up = NULL; 75 unsigned long size = 0; 76 int o_newline_added = newline_added; 77 int o_isbinary = isbinary; 78 int appended = (n == addr_last); 79 int len; 80 81 isbinary = newline_added = 0; 82 if (des) 83 init_des_cipher(); 84 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) { 85 SPL1(); 86 if (put_sbuf_line(sbuf) == NULL) { 87 SPL0(); 88 return ERR; 89 } 90 lp = lp->q_forw; 91 if (up) 92 up->t = lp; 93 else if ((up = push_undo_stack(UADD, current_addr, 94 current_addr)) == NULL) { 95 SPL0(); 96 return ERR; 97 } 98 SPL0(); 99 } 100 if (len < 0) 101 return ERR; 102 if (appended && size && o_isbinary && o_newline_added) 103 fputs("newline inserted\n", stderr); 104 else if (newline_added && (!appended || (!isbinary && !o_isbinary))) 105 fputs("newline appended\n", stderr); 106 if (isbinary && newline_added && !appended) 107 size += 1; 108 if (!size) 109 newline_added = 1; 110 newline_added = appended ? newline_added : o_newline_added; 111 isbinary = isbinary | o_isbinary; 112 if (des) 113 size += 8 - size % 8; /* adjust DES size */ 114 return size; 115 } 116 117 118 /* get_stream_line: read a line of text from a stream; return line length */ 119 int 120 get_stream_line(FILE *fp) 121 { 122 int c; 123 int i = 0; 124 125 while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) && 126 !ferror(fp))) && c != '\n') { 127 REALLOC(sbuf, sbufsz, i + 1, ERR); 128 if (!(sbuf[i++] = c)) 129 isbinary = 1; 130 } 131 REALLOC(sbuf, sbufsz, i + 2, ERR); 132 if (c == '\n') 133 sbuf[i++] = c; 134 else if (ferror(fp)) { 135 fprintf(stderr, "%s\n", strerror(errno)); 136 errmsg = "cannot read input file"; 137 return ERR; 138 } else if (i) { 139 sbuf[i++] = '\n'; 140 newline_added = 1; 141 } 142 sbuf[i] = '\0'; 143 return (isbinary && newline_added && i) ? --i : i; 144 } 145 146 147 /* write_file: write a range of lines to a named file/pipe; return line count */ 148 long 149 write_file(char *fn, const char *mode, long n, long m) 150 { 151 FILE *fp; 152 long size; 153 154 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode); 155 if (fp == NULL) { 156 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 157 errmsg = "cannot open output file"; 158 return ERR; 159 } else if ((size = write_stream(fp, n, m)) < 0) 160 return ERR; 161 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { 162 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 163 errmsg = "cannot close output file"; 164 return ERR; 165 } 166 fprintf(stdout, !scripted ? "%lu\n" : "", size); 167 return n ? m - n + 1 : 0; 168 } 169 170 171 /* write_stream: write a range of lines to a stream; return status */ 172 long 173 write_stream(FILE *fp, long n, long m) 174 { 175 line_t *lp = get_addressed_line_node(n); 176 unsigned long size = 0; 177 char *s; 178 int len; 179 180 if (des) 181 init_des_cipher(); 182 for (; n && n <= m; n++, lp = lp->q_forw) { 183 if ((s = get_sbuf_line(lp)) == NULL) 184 return ERR; 185 len = lp->len; 186 if (n != addr_last || !isbinary || !newline_added) 187 s[len++] = '\n'; 188 if (put_stream_line(fp, s, len) < 0) 189 return ERR; 190 size += len; 191 } 192 if (des) { 193 flush_des_file(fp); /* flush buffer */ 194 size += 8 - size % 8; /* adjust DES size */ 195 } 196 return size; 197 } 198 199 200 /* put_stream_line: write a line of text to a stream; return status */ 201 int 202 put_stream_line(FILE *fp, const char *s, int len) 203 { 204 while (len--) 205 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) { 206 fprintf(stderr, "%s\n", strerror(errno)); 207 errmsg = "cannot write file"; 208 return ERR; 209 } 210 return 0; 211 } 212 213 /* get_extended_line: get a an extended line from stdin */ 214 char * 215 get_extended_line(int *sizep, int nonl) 216 { 217 static char *cvbuf = NULL; /* buffer */ 218 static int cvbufsz = 0; /* buffer size */ 219 220 int l, n; 221 char *t = ibufp; 222 223 while (*t++ != '\n') 224 ; 225 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) { 226 *sizep = l; 227 return ibufp; 228 } 229 *sizep = -1; 230 REALLOC(cvbuf, cvbufsz, l, NULL); 231 memcpy(cvbuf, ibufp, l); 232 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 233 if (nonl) l--; /* strip newline */ 234 for (;;) { 235 if ((n = get_tty_line()) < 0) 236 return NULL; 237 else if (n == 0 || ibuf[n - 1] != '\n') { 238 errmsg = "unexpected end-of-file"; 239 return NULL; 240 } 241 REALLOC(cvbuf, cvbufsz, l + n, NULL); 242 memcpy(cvbuf + l, ibuf, n); 243 l += n; 244 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1)) 245 break; 246 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 247 if (nonl) l--; /* strip newline */ 248 } 249 REALLOC(cvbuf, cvbufsz, l + 1, NULL); 250 cvbuf[l] = '\0'; 251 *sizep = l; 252 return cvbuf; 253 } 254 255 256 /* get_tty_line: read a line of text from stdin; return line length */ 257 int 258 get_tty_line(void) 259 { 260 int oi = 0; 261 int i = 0; 262 int c; 263 264 for (;;) 265 switch (c = getchar()) { 266 default: 267 oi = 0; 268 REALLOC(ibuf, ibufsz, i + 2, ERR); 269 if (!(ibuf[i++] = c)) isbinary = 1; 270 if (c != '\n') 271 continue; 272 lineno++; 273 ibuf[i] = '\0'; 274 ibufp = ibuf; 275 return i; 276 case EOF: 277 if (ferror(stdin)) { 278 fprintf(stderr, "stdin: %s\n", strerror(errno)); 279 errmsg = "cannot read stdin"; 280 clearerr(stdin); 281 ibufp = NULL; 282 return ERR; 283 } else { 284 clearerr(stdin); 285 if (i != oi) { 286 oi = i; 287 continue; 288 } else if (i) 289 ibuf[i] = '\0'; 290 ibufp = ibuf; 291 return i; 292 } 293 } 294 } 295 296 297 298 #define ESCAPES "\a\b\f\n\r\t\v\\" 299 #define ESCCHARS "abfnrtv\\" 300 301 extern int rows; 302 extern int cols; 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 } 356