1 /* $OpenBSD: io.c,v 1.25 2022/11/18 14:52:03 millert Exp $ */ 2 /* $NetBSD: io.c,v 1.2 1995/03/21 09:04:43 cgd Exp $ */ 3 4 /* io.c: This file contains the i/o routines for the ed line editor */ 5 /*- 6 * Copyright (c) 1993 Andrew Moore, Talke Studio. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <regex.h> 32 #include <signal.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 37 #include "ed.h" 38 39 static int read_stream(FILE *, int); 40 static int get_stream_line(FILE *); 41 static int write_stream(FILE *, int, int); 42 static int put_stream_line(FILE *, char *, int); 43 44 extern int scripted; 45 46 /* read_file: read a named file/pipe into the buffer; return line count */ 47 int 48 read_file(char *fn, int n) 49 { 50 FILE *fp; 51 int size; 52 53 54 fp = (*fn == '!') ? popen(fn + 1, "r") : fopen(strip_escapes(fn), "r"); 55 if (fp == NULL) { 56 perror(fn); 57 seterrmsg("cannot open input file"); 58 return ERR; 59 } else if ((size = read_stream(fp, n)) < 0) 60 return ERR; 61 else if ((*fn == '!') ? pclose(fp) == -1 : fclose(fp) == EOF) { 62 perror(fn); 63 seterrmsg("cannot close input file"); 64 return ERR; 65 } 66 if (!scripted) 67 printf("%d\n", size); 68 return current_addr - n; 69 } 70 71 72 static char *sbuf; /* file i/o buffer */ 73 static int sbufsz; /* file i/o buffer size */ 74 int newline_added; /* if set, newline appended to input file */ 75 76 /* read_stream: read a stream into the editor buffer; return status */ 77 static int 78 read_stream(FILE *fp, int n) 79 { 80 line_t *lp = get_addressed_line_node(n); 81 undo_t *up = NULL; 82 unsigned int size = 0; 83 int o_newline_added = newline_added; 84 int o_isbinary = isbinary; 85 int appended = (n == addr_last); 86 int len; 87 88 isbinary = newline_added = 0; 89 for (current_addr = n; (len = get_stream_line(fp)) > 0; size += len) { 90 SPL1(); 91 if (put_sbuf_line(sbuf) == NULL) { 92 SPL0(); 93 return ERR; 94 } 95 lp = lp->q_forw; 96 if (up) 97 up->t = lp; 98 else if ((up = push_undo_stack(UADD, current_addr, 99 current_addr)) == NULL) { 100 SPL0(); 101 return ERR; 102 } 103 SPL0(); 104 } 105 if (len < 0) 106 return ERR; 107 if (appended && size && o_isbinary && o_newline_added) 108 fputs("newline inserted\n", stderr); 109 else if (newline_added && (!appended || (!isbinary && !o_isbinary))) 110 fputs("newline appended\n", stderr); 111 if (isbinary && newline_added && !appended) 112 size += 1; 113 if (!size) 114 newline_added = 1; 115 newline_added = appended ? newline_added : o_newline_added; 116 isbinary = isbinary | o_isbinary; 117 return size; 118 } 119 120 /* get_stream_line: read a line of text from a stream; return line length */ 121 static int 122 get_stream_line(FILE *fp) 123 { 124 int c; 125 int i = 0; 126 127 while (((c = getc(fp)) != EOF || (!feof(fp) && 128 !ferror(fp))) && c != '\n') { 129 REALLOC(sbuf, sbufsz, i + 1, ERR); 130 if (!(sbuf[i++] = c)) 131 isbinary = 1; 132 } 133 REALLOC(sbuf, sbufsz, i + 2, ERR); 134 if (c == '\n') 135 sbuf[i++] = c; 136 else if (ferror(fp)) { 137 perror(NULL); 138 seterrmsg("cannot read input file"); 139 return ERR; 140 } else if (i) { 141 sbuf[i++] = '\n'; 142 newline_added = 1; 143 } 144 sbuf[i] = '\0'; 145 return (isbinary && newline_added && i) ? --i : i; 146 } 147 148 149 /* write_file: write a range of lines to a named file/pipe; return line count */ 150 int 151 write_file(char *fn, char *mode, int n, int m) 152 { 153 FILE *fp; 154 int size; 155 156 fp = (*fn == '!') ? popen(fn+1, "w") : fopen(strip_escapes(fn), mode); 157 if (fp == NULL) { 158 perror(fn); 159 seterrmsg("cannot open output file"); 160 return ERR; 161 } else if ((size = write_stream(fp, n, m)) < 0) 162 return ERR; 163 else if ((*fn == '!') ? pclose(fp) == -1 : fclose(fp) == EOF) { 164 perror(fn); 165 seterrmsg("cannot close output file"); 166 return ERR; 167 } 168 if (!scripted) 169 printf("%d\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 static int 176 write_stream(FILE *fp, int n, int m) 177 { 178 line_t *lp = get_addressed_line_node(n); 179 unsigned int size = 0; 180 char *s; 181 int len; 182 183 for (; n && n <= m; n++, lp = lp->q_forw) { 184 if ((s = get_sbuf_line(lp)) == NULL) 185 return ERR; 186 len = lp->len; 187 if (n != addr_last || !isbinary || !newline_added) 188 s[len++] = '\n'; 189 if (put_stream_line(fp, s, len) < 0) 190 return ERR; 191 size += len; 192 } 193 return size; 194 } 195 196 197 /* put_stream_line: write a line of text to a stream; return status */ 198 static int 199 put_stream_line(FILE *fp, char *s, int len) 200 { 201 while (len--) { 202 if (fputc(*s, fp) == EOF) { 203 perror(NULL); 204 seterrmsg("cannot write file"); 205 return ERR; 206 } 207 s++; 208 } 209 return 0; 210 } 211 212 /* get_extended_line: get a an extended line from stdin */ 213 char * 214 get_extended_line(int *sizep, int nonl) 215 { 216 static char *cvbuf = NULL; /* buffer */ 217 static int cvbufsz = 0; /* buffer size */ 218 219 int l, n; 220 char *t = ibufp; 221 222 while (*t++ != '\n') 223 ; 224 if ((l = t - ibufp) < 2 || !has_trailing_escape(ibufp, ibufp + l - 1)) { 225 *sizep = l; 226 return ibufp; 227 } 228 *sizep = -1; 229 REALLOC(cvbuf, cvbufsz, l, NULL); 230 memcpy(cvbuf, ibufp, l); 231 *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */ 232 if (nonl) 233 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 seterrmsg("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 perror("stdin"); 279 seterrmsg("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(char *s, int l, int n, int gflag) 307 { 308 int col = 0; 309 char *cp; 310 311 if (gflag & GNP) { 312 printf("%d\t", n); 313 col = 8; 314 } 315 for (; l--; s++) { 316 if ((gflag & GLS) && ++col > cols) { 317 fputs("\\\n", stdout); 318 col = 1; 319 } 320 if (gflag & GLS) { 321 if (31 < *s && *s < 127 && *s != '\\' && *s != '$') 322 putchar(*s); 323 else { 324 putchar('\\'); 325 col++; 326 if (*s && (cp = strchr(ESCAPES, *s)) != NULL) 327 putchar(ESCCHARS[cp - ESCAPES]); 328 else { 329 putchar((((unsigned char) *s & 0300) >> 6) + '0'); 330 putchar((((unsigned char) *s & 070) >> 3) + '0'); 331 putchar(((unsigned char) *s & 07) + '0'); 332 col += 2; 333 } 334 } 335 336 } else 337 putchar(*s); 338 } 339 if (gflag & GLS) 340 putchar('$'); 341 putchar('\n'); 342 return 0; 343 } 344