inp.c revision 1.5
1 /* $NetBSD: inp.c,v 1.5 1998/11/06 22:40:13 christos Exp $ */ 2 #include <sys/cdefs.h> 3 #ifndef lint 4 __RCSID("$NetBSD: inp.c,v 1.5 1998/11/06 22:40:13 christos Exp $"); 5 #endif /* not lint */ 6 7 #include "EXTERN.h" 8 #include "common.h" 9 #include "util.h" 10 #include "pch.h" 11 #include "INTERN.h" 12 #include "inp.h" 13 14 #include <stdlib.h> 15 #include <unistd.h> 16 #include <fcntl.h> 17 18 /* Input-file-with-indexable-lines abstract type */ 19 20 static long i_size; /* size of the input file */ 21 static char *i_womp; /* plan a buffer for entire file */ 22 static char **i_ptr; /* pointers to lines in i_womp */ 23 24 static int tifd = -1; /* plan b virtual string array */ 25 static char *tibuf[2]; /* plan b buffers */ 26 static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ 27 static LINENUM lines_per_buf; /* how many lines per buffer */ 28 static int tireclen; /* length of records in tmp file */ 29 30 /* New patch--prepare to edit another file. */ 31 32 void 33 re_input() 34 { 35 if (using_plan_a) { 36 i_size = 0; 37 #ifndef lint 38 if (i_ptr != Null(char**)) 39 free((char *)i_ptr); 40 #endif 41 if (i_womp != Nullch) 42 free(i_womp); 43 i_womp = Nullch; 44 i_ptr = Null(char **); 45 } 46 else { 47 using_plan_a = TRUE; /* maybe the next one is smaller */ 48 Close(tifd); 49 tifd = -1; 50 free(tibuf[0]); 51 free(tibuf[1]); 52 tibuf[0] = tibuf[1] = Nullch; 53 tiline[0] = tiline[1] = -1; 54 tireclen = 0; 55 } 56 } 57 58 /* Constuct the line index, somehow or other. */ 59 60 void 61 scan_input(filename) 62 char *filename; 63 { 64 if (!plan_a(filename)) 65 plan_b(filename); 66 if (verbose) { 67 say3("Patching file %s using Plan %s...\n", filename, 68 (using_plan_a ? "A" : "B") ); 69 } 70 } 71 72 /* Try keeping everything in memory. */ 73 74 bool 75 plan_a(filename) 76 char *filename; 77 { 78 int ifd, statfailed; 79 Reg1 char *s; 80 Reg2 LINENUM iline; 81 char lbuf[MAXLINELEN]; 82 83 statfailed = stat(filename, &filestat); 84 if (statfailed && ok_to_create_file) { 85 if (verbose) 86 say2("(Creating file %s...)\n",filename); 87 makedirs(filename, TRUE); 88 close(creat(filename, 0666)); 89 statfailed = stat(filename, &filestat); 90 } 91 /* For nonexistent or read-only files, look for RCS or SCCS versions. */ 92 if (statfailed 93 /* No one can write to it. */ 94 || (filestat.st_mode & 0222) == 0 95 /* I can't write to it. */ 96 || ((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) { 97 struct stat cstat; 98 char *cs = Nullch; 99 char *filebase; 100 int pathlen; 101 102 filebase = basename(filename); 103 pathlen = filebase - filename; 104 105 /* Put any leading path into `s'. 106 Leave room in lbuf for the diff command. */ 107 s = lbuf + 20; 108 strncpy(s, filename, pathlen); 109 110 #define try(f, a1, a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0) 111 #define try1(f, a1) (Sprintf(s + pathlen, f, a1), stat(s, &cstat) == 0) 112 if ( try("RCS/%s%s", filebase, RCSSUFFIX) 113 || try1("RCS/%s" , filebase) 114 || try( "%s%s", filebase, RCSSUFFIX)) { 115 Sprintf(buf, CHECKOUT, filename); 116 Sprintf(lbuf, RCSDIFF, filename); 117 cs = "RCS"; 118 } else if ( try("SCCS/%s%s", SCCSPREFIX, filebase) 119 || try( "%s%s", SCCSPREFIX, filebase)) { 120 Sprintf(buf, GET, s); 121 Sprintf(lbuf, SCCSDIFF, s, filename); 122 cs = "SCCS"; 123 } else if (statfailed) 124 fatal2("can't find %s\n", filename); 125 /* else we can't write to it but it's not under a version 126 control system, so just proceed. */ 127 if (cs) { 128 if (!statfailed) { 129 if ((filestat.st_mode & 0222) != 0) 130 /* The owner can write to it. */ 131 fatal3("file %s seems to be locked by somebody else under %s\n", 132 filename, cs); 133 /* It might be checked out unlocked. See if it's safe to 134 check out the default version locked. */ 135 if (verbose) 136 say3("Comparing file %s to default %s version...\n", 137 filename, cs); 138 if (system(lbuf)) 139 fatal3("can't check out file %s: differs from default %s version\n", 140 filename, cs); 141 } 142 if (verbose) 143 say3("Checking out file %s from %s...\n", filename, cs); 144 if (system(buf) || stat(filename, &filestat)) 145 fatal3("can't check out file %s from %s\n", filename, cs); 146 } 147 } 148 filemode = filestat.st_mode; 149 if (!S_ISREG(filemode)) 150 fatal2("%s is not a normal file--can't patch\n", filename); 151 i_size = filestat.st_size; 152 if (out_of_mem) { 153 set_hunkmax(); /* make sure dynamic arrays are allocated */ 154 out_of_mem = FALSE; 155 return FALSE; /* force plan b because plan a bombed */ 156 } 157 #ifdef lint 158 i_womp = Nullch; 159 #else 160 i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */ 161 /* i_size, but that's okay, I think. */ 162 #endif 163 if (i_womp == Nullch) 164 return FALSE; 165 if ((ifd = open(filename, 0)) < 0) 166 pfatal2("can't open file %s", filename); 167 #ifndef lint 168 if (read(ifd, i_womp, (int)i_size) != i_size) { 169 Close(ifd); /* probably means i_size > 15 or 16 bits worth */ 170 free(i_womp); /* at this point it doesn't matter if i_womp was */ 171 return FALSE; /* undersized. */ 172 } 173 #endif 174 Close(ifd); 175 if (i_size && i_womp[i_size-1] != '\n') 176 i_womp[i_size++] = '\n'; 177 i_womp[i_size] = '\0'; 178 179 /* count the lines in the buffer so we know how many pointers we need */ 180 181 iline = 0; 182 for (s=i_womp; *s; s++) { 183 if (*s == '\n') 184 iline++; 185 } 186 #ifdef lint 187 i_ptr = Null(char**); 188 #else 189 i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *))); 190 #endif 191 if (i_ptr == Null(char **)) { /* shucks, it was a near thing */ 192 free((char *)i_womp); 193 return FALSE; 194 } 195 196 /* now scan the buffer and build pointer array */ 197 198 iline = 1; 199 i_ptr[iline] = i_womp; 200 for (s=i_womp; *s; s++) { 201 if (*s == '\n') 202 i_ptr[++iline] = s+1; /* these are NOT null terminated */ 203 } 204 input_lines = iline - 1; 205 206 /* now check for revision, if any */ 207 208 if (revision != Nullch) { 209 if (!rev_in_string(i_womp)) { 210 if (force) { 211 if (verbose) 212 say2( 213 "Warning: this file doesn't appear to be the %s version--patching anyway.\n", 214 revision); 215 } 216 else if (batch) { 217 fatal2( 218 "this file doesn't appear to be the %s version--aborting.\n", revision); 219 } 220 else { 221 ask2( 222 "This file doesn't appear to be the %s version--patch anyway? [n] ", 223 revision); 224 if (*buf != 'y') 225 fatal1("aborted\n"); 226 } 227 } 228 else if (verbose) 229 say2("Good. This file appears to be the %s version.\n", 230 revision); 231 } 232 return TRUE; /* plan a will work */ 233 } 234 235 /* Keep (virtually) nothing in memory. */ 236 237 void 238 plan_b(filename) 239 char *filename; 240 { 241 Reg3 FILE *ifp; 242 Reg1 int i = 0; 243 Reg2 int maxlen = 1; 244 Reg4 bool found_revision = (revision == Nullch); 245 246 using_plan_a = FALSE; 247 if ((ifp = fopen(filename, "r")) == Nullfp) 248 pfatal2("can't open file %s", filename); 249 if ((tifd = creat(TMPINNAME, 0666)) < 0) 250 pfatal2("can't open file %s", TMPINNAME); 251 while (fgets(buf, sizeof buf, ifp) != Nullch) { 252 if (revision != Nullch && !found_revision && rev_in_string(buf)) 253 found_revision = TRUE; 254 if ((i = strlen(buf)) > maxlen) 255 maxlen = i; /* find longest line */ 256 } 257 if (revision != Nullch) { 258 if (!found_revision) { 259 if (force) { 260 if (verbose) 261 say2( 262 "Warning: this file doesn't appear to be the %s version--patching anyway.\n", 263 revision); 264 } 265 else if (batch) { 266 fatal2( 267 "this file doesn't appear to be the %s version--aborting.\n", revision); 268 } 269 else { 270 ask2( 271 "This file doesn't appear to be the %s version--patch anyway? [n] ", 272 revision); 273 if (*buf != 'y') 274 fatal1("aborted\n"); 275 } 276 } 277 else if (verbose) 278 say2("Good. This file appears to be the %s version.\n", 279 revision); 280 } 281 Fseek(ifp, 0L, 0); /* rewind file */ 282 lines_per_buf = BUFFERSIZE / maxlen; 283 tireclen = maxlen; 284 tibuf[0] = malloc((MEM)(BUFFERSIZE + 1)); 285 tibuf[1] = malloc((MEM)(BUFFERSIZE + 1)); 286 if (tibuf[1] == Nullch) 287 fatal1("out of memory\n"); 288 for (i=1; ; i++) { 289 if (! (i % lines_per_buf)) /* new block */ 290 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 291 pfatal1("can't write temp file"); 292 if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp) 293 == Nullch) { 294 input_lines = i - 1; 295 if (i % lines_per_buf) 296 if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) 297 pfatal1("can't write temp file"); 298 break; 299 } 300 } 301 Fclose(ifp); 302 Close(tifd); 303 if ((tifd = open(TMPINNAME, 0)) < 0) { 304 pfatal2("can't reopen file %s", TMPINNAME); 305 } 306 } 307 308 /* Fetch a line from the input file, \n terminated, not necessarily \0. */ 309 310 char * 311 ifetch(line,whichbuf) 312 Reg1 LINENUM line; 313 int whichbuf; /* ignored when file in memory */ 314 { 315 if (line < 1 || line > input_lines) 316 return ""; 317 if (using_plan_a) 318 return i_ptr[line]; 319 else { 320 LINENUM offline = line % lines_per_buf; 321 LINENUM baseline = line - offline; 322 323 if (tiline[0] == baseline) 324 whichbuf = 0; 325 else if (tiline[1] == baseline) 326 whichbuf = 1; 327 else { 328 tiline[whichbuf] = baseline; 329 #ifndef lint /* complains of long accuracy */ 330 Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0); 331 #endif 332 if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) 333 pfatal2("error reading tmp file %s", TMPINNAME); 334 } 335 return tibuf[whichbuf] + (tireclen*offline); 336 } 337 } 338 339 /* True if the string argument contains the revision number we want. */ 340 341 bool 342 rev_in_string(string) 343 char *string; 344 { 345 Reg1 char *s; 346 Reg2 int patlen; 347 348 if (revision == Nullch) 349 return TRUE; 350 patlen = strlen(revision); 351 if (strnEQ(string,revision,patlen) && isspace((unsigned char)string[patlen])) 352 return TRUE; 353 for (s = string; *s; s++) { 354 if (isspace((unsigned char)*s) && strnEQ(s+1, revision, patlen) && 355 isspace((unsigned char)s[patlen+1] )) { 356 return TRUE; 357 } 358 } 359 return FALSE; 360 } 361
Indexes created Mon Sep 22 13:09:51 GMT 2025