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 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 } else if ((size = read_stream(fp, n)) < 0) 47 return ERR; 48 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { 49 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 50 errmsg = "cannot close input file"; 51 return ERR; 52 } 53 if (!scripted) 54 fprintf(stdout, "%lu\n", size); 55 return current_addr - n; 56 } 57 58 static char *sbuf; /* file i/o buffer */ 59 static int sbufsz; /* file i/o buffer size */ 60 int newline_added; /* if set, newline appended to input file */ 61 62 /* read_stream: read a stream into the editor buffer; return status */ 63 long 64 read_stream(FILE *fp, long n) 65 { 66 line_t *lp = get_addressed_line_node(n); 67 undo_t *up = NULL; 68 unsigned long size = 0; 69 int o_newline_added = newline_added; 70 int o_isbinary = isbinary; 71 int appended = (n == addr_last); 72 int len; 73 74 isbinary = newline_added = 0; 75 if (des) 76 init_des_cipher(); 77 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) { 78 SPL1(); 79 if (put_sbuf_line(sbuf) == NULL) { 80 SPL0(); 81 return ERR; 82 } 83 lp = lp->q_forw; 84 if (up) 85 up->t = lp; 86 else if ((up = push_undo_stack(UADD, current_addr, 87 current_addr)) == NULL) { 88 SPL0(); 89 return ERR; 90 } 91 SPL0(); 92 } 93 if (len < 0) 94 return ERR; 95 if (appended && size && o_isbinary && o_newline_added) 96 fputs("newline inserted\n", stderr); 97 else if (newline_added && (!appended || (!isbinary && !o_isbinary))) 98 fputs("newline appended\n", stderr); 99 if (isbinary && newline_added && !appended) 100 size += 1; 101 if (!size) 102 newline_added = 1; 103 newline_added = appended ? newline_added : o_newline_added; 104 isbinary = isbinary | o_isbinary; 105 if (des) 106 size += 8 - size % 8; /* adjust DES size */ 107 return size; 108 } 109 110 111 /* get_stream_line: read a line of text from a stream; return line length */ 112 int 113 get_stream_line(FILE *fp) 114 { 115 int c; 116 int i = 0; 117 118 while (((c = des ? get_des_char(fp) : getc(fp)) != EOF || (!feof(fp) && 119 !ferror(fp))) && c != '\n') { 120 REALLOC(sbuf, sbufsz, i + 1, ERR); 121 if (!(sbuf[i++] = c)) 122 isbinary = 1; 123 } 124 REALLOC(sbuf, sbufsz, i + 2, ERR); 125 if (c == '\n') 126 sbuf[i++] = c; 127 else if (ferror(fp)) { 128 fprintf(stderr, "%s\n", strerror(errno)); 129 errmsg = "cannot read input file"; 130 return ERR; 131 } else if (i) { 132 sbuf[i++] = '\n'; 133 newline_added = 1; 134 } 135 sbuf[i] = '\0'; 136 return (isbinary && newline_added && i) ? --i : i; 137 } 138 139 140 /* write_file: write a range of lines to a named file/pipe; return line count */ 141 long 142 write_file(char *fn, const char *mode, long n, long m) 143 { 144 FILE *fp; 145 long size; 146 147 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode); 148 if (fp == NULL) { 149 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 150 errmsg = "cannot open output file"; 151 return ERR; 152 } else if ((size = write_stream(fp, n, m)) < 0) 153 return ERR; 154 else if (((*fn == '!') ? pclose(fp) : fclose(fp)) < 0) { 155 fprintf(stderr, "%s: %s\n", fn, strerror(errno)); 156 errmsg = "cannot close output file"; 157 return ERR; 158 } 159 if (!scripted) 160 fprintf(stdout, "%lu\n", size); 161 return n ? m - n + 1 : 0; 162 } 163 164 165 /* write_stream: write a range of lines to a stream; return status */ 166 long 167 write_stream(FILE *fp, long n, long m) 168 { 169 line_t *lp = get_addressed_line_node(n); 170 unsigned long size = 0; 171 char *s; 172 int len; 173 174 if (des) 175 init_des_cipher(); 176 for (; n && n <= m; n++, lp = lp->q_forw) { 177 if ((s = get_sbuf_line(lp)) == NULL) 178 return ERR; 179 len = lp->len; 180 if (n != addr_last || !isbinary || !newline_added) 181 s[len++] = '\n'; 182 if (put_stream_line(fp, s, len) < 0) 183 return ERR; 184 size += len; 185 } 186 if (des) { 187 flush_des_file(fp); /* flush buffer */ 188 size += 8 - size % 8; /* adjust DES size */ 189 } 190 return size; 191 } 192 193 194 /* put_stream_line: write a line of text to a stream; return status */ 195 int 196 put_stream_line(FILE *fp, const char *s, int len) 197 { 198 while (len--) 199 if ((des ? put_des_char(*s++, fp) : fputc(*s++, fp)) < 0) { 200 fprintf(stderr, "%s\n", strerror(errno)); 201 errmsg = "cannot write file"; 202 return ERR; 203 } 204 return 0; 205 } 206 207 /* get_extended_line: get an extended line from stdin */ 208 char * 209 get_extended_line(int *sizep, int nonl) 210 { 211 static char *cvbuf = NULL; /* buffer */ 212 static int cvbufsz = 0; /* buffer size */ 213 214 int l, n; 215 char *t = ibufp; 216 217 while (*t++ != '\n') 218 ; 219 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) { 220 *sizep = l; 221 return ibufp; 222 } 223 *sizep = -1; 224 REALLOC(cvbuf, cvbufsz, l, NULL); 225 memcpy(cvbuf, ibufp, l); 226 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 227 if (nonl) l--; /* strip newline */ 228 for (;;) { 229 if ((n = get_tty_line()) < 0) 230 return NULL; 231 else if (n == 0 || ibuf[n - 1] != '\n') { 232 errmsg = "unexpected end-of-file"; 233 return NULL; 234 } 235 REALLOC(cvbuf, cvbufsz, l + n, NULL); 236 memcpy(cvbuf + l, ibuf, n); 237 l += n; 238 if (n < 2 || !has_trailing_escape(cvbuf, cvbuf + l - 1)) 239 break; 240 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 241 if (nonl) l--; /* strip newline */ 242 } 243 REALLOC(cvbuf, cvbufsz, l + 1, NULL); 244 cvbuf[l] = '\0'; 245 *sizep = l; 246 return cvbuf; 247 } 248 249 250 /* get_tty_line: read a line of text from stdin; return line length */ 251 int 252 get_tty_line(void) 253 { 254 int oi = 0; 255 int i = 0; 256 int c; 257 258 for (;;) 259 switch (c = getchar()) { 260 default: 261 oi = 0; 262 REALLOC(ibuf, ibufsz, i + 2, ERR); 263 if (!(ibuf[i++] = c)) isbinary = 1; 264 if (c != '\n') 265 continue; 266 lineno++; 267 ibuf[i] = '\0'; 268 ibufp = ibuf; 269 return i; 270 case EOF: 271 if (ferror(stdin)) { 272 fprintf(stderr, "stdin: %s\n", strerror(errno)); 273 errmsg = "cannot read stdin"; 274 clearerr(stdin); 275 ibufp = NULL; 276 return ERR; 277 } else { 278 clearerr(stdin); 279 if (i != oi) { 280 oi = i; 281 continue; 282 } else if (i) 283 ibuf[i] = '\0'; 284 ibufp = ibuf; 285 return i; 286 } 287 } 288 } 289 290 291 292 #define ESCAPES "\a\b\f\n\r\t\v\\" 293 #define ESCCHARS "abfnrtv\\" 294 295 /* put_tty_line: print text to stdout */ 296 int 297 put_tty_line(const char *s, int l, long n, int gflag) 298 { 299 int col = 0; 300 int lc = 0; 301 char *cp; 302 303 if (gflag & GNP) { 304 printf("%ld\t", n); 305 col = 8; 306 } 307 for (; l--; s++) { 308 if ((gflag & GLS) && ++col > cols) { 309 fputs("\\\n", stdout); 310 col = 1; 311 #ifndef BACKWARDS 312 if (!scripted && !isglobal && ++lc > rows) { 313 lc = 0; 314 fputs("Press <RETURN> to continue... ", stdout); 315 fflush(stdout); 316 if (get_tty_line() < 0) 317 return ERR; 318 } 319 #endif 320 } 321 if (gflag & GLS) { 322 if (31 < *s && *s < 127 && *s != '\\') 323 putchar(*s); 324 else { 325 putchar('\\'); 326 col++; 327 if (*s && (cp = strchr(ESCAPES, *s)) != NULL) 328 putchar(ESCCHARS[cp - ESCAPES]); 329 else { 330 putchar((((unsigned char) *s & 0300) >> 6) + '0'); 331 putchar((((unsigned char) *s & 070) >> 3) + '0'); 332 putchar(((unsigned char) *s & 07) + '0'); 333 col += 2; 334 } 335 } 336 337 } else 338 putchar(*s); 339 } 340 #ifndef BACKWARDS 341 if (gflag & GLS) 342 putchar('$'); 343 #endif 344 putchar('\n'); 345 return 0; 346 } 347