1 /* $OpenBSD: buf.c,v 1.18 2008/02/12 07:57:29 otto Exp $ */ 2 /* $NetBSD: buf.c,v 1.15 1995/04/23 10:07:28 cgd Exp $ */ 3 4 /* buf.c: This file contains the scratch-file buffer routines for the 5 ed line editor. */ 6 /*- 7 * Copyright (c) 1993 Andrew Moore, Talke Studio. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #if 0 34 static char *rcsid = "@(#)buf.c,v 1.4 1994/02/01 00:34:35 alm Exp"; 35 #else 36 static char rcsid[] = "$OpenBSD: buf.c,v 1.18 2008/02/12 07:57:29 otto Exp $"; 37 #endif 38 #endif /* not lint */ 39 40 #include <sys/file.h> 41 #include <sys/stat.h> 42 43 #include "ed.h" 44 45 46 FILE *sfp; /* scratch file pointer */ 47 off_t sfseek; /* scratch file position */ 48 int seek_write; /* seek before writing */ 49 line_t buffer_head; /* incore buffer */ 50 51 /* get_sbuf_line: get a line of text from the scratch file; return pointer 52 to the text */ 53 char * 54 get_sbuf_line(line_t *lp) 55 { 56 static char *sfbuf = NULL; /* buffer */ 57 static int sfbufsz = 0; /* buffer size */ 58 59 int len, ct; 60 61 if (lp == &buffer_head) 62 return NULL; 63 seek_write = 1; /* force seek on write */ 64 /* out of position */ 65 if (sfseek != lp->seek) { 66 sfseek = lp->seek; 67 if (fseeko(sfp, sfseek, SEEK_SET) < 0) { 68 perror(NULL); 69 seterrmsg("cannot seek temp file"); 70 return NULL; 71 } 72 } 73 len = lp->len; 74 REALLOC(sfbuf, sfbufsz, len + 1, NULL); 75 if ((ct = fread(sfbuf, sizeof(char), len, sfp)) < 0 || ct != len) { 76 perror(NULL); 77 seterrmsg("cannot read temp file"); 78 return NULL; 79 } 80 sfseek += len; /* update file position */ 81 sfbuf[len] = '\0'; 82 return sfbuf; 83 } 84 85 86 /* put_sbuf_line: write a line of text to the scratch file and add a line node 87 to the editor buffer; return a pointer to the end of the text */ 88 char * 89 put_sbuf_line(char *cs) 90 { 91 line_t *lp; 92 int len, ct; 93 char *s; 94 95 if ((lp = (line_t *) malloc(sizeof(line_t))) == NULL) { 96 perror(NULL); 97 seterrmsg("out of memory"); 98 return NULL; 99 } 100 /* assert: cs is '\n' terminated */ 101 for (s = cs; *s != '\n'; s++) 102 ; 103 if (s - cs >= LINECHARS) { 104 seterrmsg("line too long"); 105 free(lp); 106 return NULL; 107 } 108 len = s - cs; 109 /* out of position */ 110 if (seek_write) { 111 if (fseek(sfp, 0L, SEEK_END) < 0) { 112 perror(NULL); 113 seterrmsg("cannot seek temp file"); 114 free(lp); 115 return NULL; 116 } 117 sfseek = ftello(sfp); 118 seek_write = 0; 119 } 120 /* assert: SPL1() */ 121 if ((ct = fwrite(cs, sizeof(char), len, sfp)) < 0 || ct != len) { 122 sfseek = -1; 123 perror(NULL); 124 seterrmsg("cannot write temp file"); 125 free(lp); 126 return NULL; 127 } 128 lp->len = len; 129 lp->seek = sfseek; 130 add_line_node(lp); 131 sfseek += len; /* update file position */ 132 return ++s; 133 } 134 135 136 /* add_line_node: add a line node in the editor buffer after the current line */ 137 void 138 add_line_node(line_t *lp) 139 { 140 line_t *cp; 141 142 /* this get_addressed_line_node last! */ 143 cp = get_addressed_line_node(current_addr); 144 INSQUE(lp, cp); 145 addr_last++; 146 current_addr++; 147 } 148 149 150 /* get_line_node_addr: return line number of pointer */ 151 int 152 get_line_node_addr(line_t *lp) 153 { 154 line_t *cp = &buffer_head; 155 int n = 0; 156 157 while (cp != lp && (cp = cp->q_forw) != &buffer_head) 158 n++; 159 if (n && cp == &buffer_head) { 160 seterrmsg("invalid address"); 161 return ERR; 162 } 163 return n; 164 } 165 166 167 /* get_addressed_line_node: return pointer to a line node in the editor buffer */ 168 line_t * 169 get_addressed_line_node(int n) 170 { 171 static line_t *lp = &buffer_head; 172 static int on = 0; 173 174 SPL1(); 175 if (n > on) { 176 if (n <= (on + addr_last) >> 1) 177 for (; on < n; on++) 178 lp = lp->q_forw; 179 else { 180 lp = buffer_head.q_back; 181 for (on = addr_last; on > n; on--) 182 lp = lp->q_back; 183 } 184 } else { 185 if (n >= on >> 1) 186 for (; on > n; on--) 187 lp = lp->q_back; 188 else { 189 lp = &buffer_head; 190 for (on = 0; on < n; on++) 191 lp = lp->q_forw; 192 } 193 } 194 SPL0(); 195 return lp; 196 } 197 198 199 extern int newline_added; 200 201 #define SCRATCH_TEMPLATE "/tmp/ed.XXXXXXXXXX" 202 char sfn[sizeof(SCRATCH_TEMPLATE)+1] = ""; /* scratch file name */ 203 204 /* open_sbuf: open scratch file */ 205 int 206 open_sbuf(void) 207 { 208 int fd = -1; 209 210 isbinary = newline_added = 0; 211 strlcpy(sfn, SCRATCH_TEMPLATE, sizeof sfn); 212 if ((fd = mkstemp(sfn)) == -1 || 213 (sfp = fdopen(fd, "w+")) == NULL) { 214 if (fd != -1) 215 close(fd); 216 perror(sfn); 217 seterrmsg("cannot open temp file"); 218 return ERR; 219 } 220 return 0; 221 } 222 223 224 /* close_sbuf: close scratch file */ 225 int 226 close_sbuf(void) 227 { 228 if (sfp) { 229 if (fclose(sfp) < 0) { 230 perror(sfn); 231 seterrmsg("cannot close temp file"); 232 return ERR; 233 } 234 sfp = NULL; 235 unlink(sfn); 236 } 237 sfseek = seek_write = 0; 238 return 0; 239 } 240 241 242 /* quit: remove_lines scratch file and exit */ 243 void 244 quit(int n) 245 { 246 if (sfp) { 247 fclose(sfp); 248 unlink(sfn); 249 } 250 exit(n); 251 } 252 253 254 unsigned char ctab[256]; /* character translation table */ 255 256 /* init_buffers: open scratch buffer; initialize line queue */ 257 void 258 init_buffers(void) 259 { 260 int i = 0; 261 262 /* Read stdin one character at a time to avoid i/o contention 263 with shell escapes invoked by nonterminal input, e.g., 264 ed - <<EOF 265 !cat 266 hello, world 267 EOF */ 268 setbuffer(stdin, stdinbuf, 1); 269 if (open_sbuf() < 0) 270 quit(2); 271 REQUE(&buffer_head, &buffer_head); 272 for (i = 0; i < 256; i++) 273 ctab[i] = i; 274 } 275 276 277 /* translit_text: translate characters in a string */ 278 char * 279 translit_text(char *s, int len, int from, int to) 280 { 281 static int i = 0; 282 283 unsigned char *us; 284 285 ctab[i] = i; /* restore table to initial state */ 286 ctab[i = from] = to; 287 for (us = (unsigned char *) s; len-- > 0; us++) 288 *us = ctab[*us]; 289 return s; 290 } 291