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   1 /* $Header: inp.c,v 2.0.1.1 88/06/03 15:06:13 lwall Locked $
   2  *
   3  * $Log:        inp.c,v $
   4  * Revision 2.0.1.1  88/06/03  15:06:13  lwall
   5  * patch10: made a little smarter about sccs files
   6  *
   7  * Revision 2.0  86/09/17  15:37:02  lwall
   8  * Baseline for netwide release.
   9  *
  10  */
  11
  12 #include "EXTERN.h"
  13 #include "common.h"
  14 #include "util.h"
  15 #include "pch.h"
  16 #include "INTERN.h"
  17 #include "inp.h"
  18
  19 /* Input-file-with-indexable-lines abstract type */
  20
  21 static long i_size;                     /* size of the input file */
  22 static char *i_womp;                    /* plan a buffer for entire file */
  23 static char **i_ptr;                    /* pointers to lines in i_womp */
  24
  25 static int tifd = -1;                   /* plan b virtual string array */
  26 static char *tibuf[2];                  /* plan b buffers */
  27 static LINENUM tiline[2] = {-1, -1};    /* 1st line in each buffer */
  28 static LINENUM lines_per_buf;           /* how many lines per buffer */
  29 static int tireclen;                    /* length of records in tmp file */
  30
  31 /* New patch--prepare to edit another file. */
  32
  33 void
  34 re_input()
  35 {
  36     if (using_plan_a) {
  37         i_size = 0;
  38 #ifndef lint
  39         if (i_ptr != Null(char**))
  40             free((char *)i_ptr);
  41 #endif
  42         if (i_womp != Nullch)
  43             free(i_womp);
  44         i_womp = Nullch;
  45         i_ptr = Null(char **);
  46     }
  47     else {
  48         using_plan_a = TRUE;            /* maybe the next one is smaller */
  49         Close(tifd);
  50         tifd = -1;
  51         free(tibuf[0]);
  52         free(tibuf[1]);
  53         tibuf[0] = tibuf[1] = Nullch;
  54         tiline[0] = tiline[1] = -1;
  55         tireclen = 0;
  56     }
  57 }
  58
  59 /* Constuct the line index, somehow or other. */
  60
  61 void
  62 scan_input(filename)
  63 char *filename;
  64 {
  65     if (!plan_a(filename))
  66         plan_b(filename);
  67     if (verbose) {
  68         say3("Patching file %s using Plan %s...\n", filename,
  69           (using_plan_a ? "A" : "B") );
  70     }
  71 }
  72
  73 /* Try keeping everything in memory. */
  74
  75 bool
  76 plan_a(filename)
  77 char *filename;
  78 {
  79     int ifd, statfailed;
  80     Reg1 char *s;
  81     Reg2 LINENUM iline;
  82     char lbuf[MAXLINELEN];
  83
  84     statfailed = stat(filename, &filestat);
  85     if (statfailed && ok_to_create_file) {
  86         if (verbose)
  87             say2("(Creating file %s...)\n",filename);
  88         makedirs(filename, TRUE);
  89         close(creat(filename, 0666));
  90         statfailed = stat(filename, &filestat);
  91     }
  92     /* For nonexistent or read-only files, look for RCS or SCCS versions.  */
  93     if (statfailed
  94         /* No one can write to it.  */
  95         || (filestat.st_mode & 0222) == 0
  96         /* I can't write to it.  */
  97         || ((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) {
  98         struct stat cstat;
  99         char *cs = Nullch;
 100         char *filebase;
 101         int pathlen;
 102
 103         filebase = basename(filename);
 104         pathlen = filebase - filename;
 105
 106         /* Put any leading path into `s'.
 107            Leave room in lbuf for the diff command.  */
 108         s = lbuf + 20;
 109         strncpy(s, filename, pathlen);
 110
 111 #define try(f, a1, a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0)
 112         if (   try("RCS/%s%s", filebase, RCSSUFFIX)
 113             || try("RCS/%s"  , filebase,         0)
 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(string[patlen]))
 352         return TRUE;
 353     for (s = string; *s; s++) {
 354         if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
 355                 isspace(s[patlen+1] )) {
 356             return TRUE;
 357         }
 358     }
 359     return FALSE;
 360 }