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 /* 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 } 356