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