Annotation of src/usr.bin/patch/inp.c, Revision 1.1
1.1 ! deraadt 1: #ifndef lint
! 2: static char rcsid[] = "$Id: inp.c,v 1.2 1993/08/02 17:55:16 mycroft Exp $";
! 3: #endif /* not lint */
! 4:
! 5: #include "EXTERN.h"
! 6: #include "common.h"
! 7: #include "util.h"
! 8: #include "pch.h"
! 9: #include "INTERN.h"
! 10: #include "inp.h"
! 11:
! 12: /* Input-file-with-indexable-lines abstract type */
! 13:
! 14: static long i_size; /* size of the input file */
! 15: static char *i_womp; /* plan a buffer for entire file */
! 16: static char **i_ptr; /* pointers to lines in i_womp */
! 17:
! 18: static int tifd = -1; /* plan b virtual string array */
! 19: static char *tibuf[2]; /* plan b buffers */
! 20: static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
! 21: static LINENUM lines_per_buf; /* how many lines per buffer */
! 22: static int tireclen; /* length of records in tmp file */
! 23:
! 24: /* New patch--prepare to edit another file. */
! 25:
! 26: void
! 27: re_input()
! 28: {
! 29: if (using_plan_a) {
! 30: i_size = 0;
! 31: #ifndef lint
! 32: if (i_ptr != Null(char**))
! 33: free((char *)i_ptr);
! 34: #endif
! 35: if (i_womp != Nullch)
! 36: free(i_womp);
! 37: i_womp = Nullch;
! 38: i_ptr = Null(char **);
! 39: }
! 40: else {
! 41: using_plan_a = TRUE; /* maybe the next one is smaller */
! 42: Close(tifd);
! 43: tifd = -1;
! 44: free(tibuf[0]);
! 45: free(tibuf[1]);
! 46: tibuf[0] = tibuf[1] = Nullch;
! 47: tiline[0] = tiline[1] = -1;
! 48: tireclen = 0;
! 49: }
! 50: }
! 51:
! 52: /* Constuct the line index, somehow or other. */
! 53:
! 54: void
! 55: scan_input(filename)
! 56: char *filename;
! 57: {
! 58: if (!plan_a(filename))
! 59: plan_b(filename);
! 60: if (verbose) {
! 61: say3("Patching file %s using Plan %s...\n", filename,
! 62: (using_plan_a ? "A" : "B") );
! 63: }
! 64: }
! 65:
! 66: /* Try keeping everything in memory. */
! 67:
! 68: bool
! 69: plan_a(filename)
! 70: char *filename;
! 71: {
! 72: int ifd, statfailed;
! 73: Reg1 char *s;
! 74: Reg2 LINENUM iline;
! 75: char lbuf[MAXLINELEN];
! 76:
! 77: statfailed = stat(filename, &filestat);
! 78: if (statfailed && ok_to_create_file) {
! 79: if (verbose)
! 80: say2("(Creating file %s...)\n",filename);
! 81: makedirs(filename, TRUE);
! 82: close(creat(filename, 0666));
! 83: statfailed = stat(filename, &filestat);
! 84: }
! 85: /* For nonexistent or read-only files, look for RCS or SCCS versions. */
! 86: if (statfailed
! 87: /* No one can write to it. */
! 88: || (filestat.st_mode & 0222) == 0
! 89: /* I can't write to it. */
! 90: || ((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) {
! 91: struct stat cstat;
! 92: char *cs = Nullch;
! 93: char *filebase;
! 94: int pathlen;
! 95:
! 96: filebase = basename(filename);
! 97: pathlen = filebase - filename;
! 98:
! 99: /* Put any leading path into `s'.
! 100: Leave room in lbuf for the diff command. */
! 101: s = lbuf + 20;
! 102: strncpy(s, filename, pathlen);
! 103:
! 104: #define try(f, a1, a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0)
! 105: if ( try("RCS/%s%s", filebase, RCSSUFFIX)
! 106: || try("RCS/%s" , filebase, 0)
! 107: || try( "%s%s", filebase, RCSSUFFIX)) {
! 108: Sprintf(buf, CHECKOUT, filename);
! 109: Sprintf(lbuf, RCSDIFF, filename);
! 110: cs = "RCS";
! 111: } else if ( try("SCCS/%s%s", SCCSPREFIX, filebase)
! 112: || try( "%s%s", SCCSPREFIX, filebase)) {
! 113: Sprintf(buf, GET, s);
! 114: Sprintf(lbuf, SCCSDIFF, s, filename);
! 115: cs = "SCCS";
! 116: } else if (statfailed)
! 117: fatal2("can't find %s\n", filename);
! 118: /* else we can't write to it but it's not under a version
! 119: control system, so just proceed. */
! 120: if (cs) {
! 121: if (!statfailed) {
! 122: if ((filestat.st_mode & 0222) != 0)
! 123: /* The owner can write to it. */
! 124: fatal3("file %s seems to be locked by somebody else under %s\n",
! 125: filename, cs);
! 126: /* It might be checked out unlocked. See if it's safe to
! 127: check out the default version locked. */
! 128: if (verbose)
! 129: say3("Comparing file %s to default %s version...\n",
! 130: filename, cs);
! 131: if (system(lbuf))
! 132: fatal3("can't check out file %s: differs from default %s version\n",
! 133: filename, cs);
! 134: }
! 135: if (verbose)
! 136: say3("Checking out file %s from %s...\n", filename, cs);
! 137: if (system(buf) || stat(filename, &filestat))
! 138: fatal3("can't check out file %s from %s\n", filename, cs);
! 139: }
! 140: }
! 141: filemode = filestat.st_mode;
! 142: if (!S_ISREG(filemode))
! 143: fatal2("%s is not a normal file--can't patch\n", filename);
! 144: i_size = filestat.st_size;
! 145: if (out_of_mem) {
! 146: set_hunkmax(); /* make sure dynamic arrays are allocated */
! 147: out_of_mem = FALSE;
! 148: return FALSE; /* force plan b because plan a bombed */
! 149: }
! 150: #ifdef lint
! 151: i_womp = Nullch;
! 152: #else
! 153: i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */
! 154: /* i_size, but that's okay, I think. */
! 155: #endif
! 156: if (i_womp == Nullch)
! 157: return FALSE;
! 158: if ((ifd = open(filename, 0)) < 0)
! 159: pfatal2("can't open file %s", filename);
! 160: #ifndef lint
! 161: if (read(ifd, i_womp, (int)i_size) != i_size) {
! 162: Close(ifd); /* probably means i_size > 15 or 16 bits worth */
! 163: free(i_womp); /* at this point it doesn't matter if i_womp was */
! 164: return FALSE; /* undersized. */
! 165: }
! 166: #endif
! 167: Close(ifd);
! 168: if (i_size && i_womp[i_size-1] != '\n')
! 169: i_womp[i_size++] = '\n';
! 170: i_womp[i_size] = '\0';
! 171:
! 172: /* count the lines in the buffer so we know how many pointers we need */
! 173:
! 174: iline = 0;
! 175: for (s=i_womp; *s; s++) {
! 176: if (*s == '\n')
! 177: iline++;
! 178: }
! 179: #ifdef lint
! 180: i_ptr = Null(char**);
! 181: #else
! 182: i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
! 183: #endif
! 184: if (i_ptr == Null(char **)) { /* shucks, it was a near thing */
! 185: free((char *)i_womp);
! 186: return FALSE;
! 187: }
! 188:
! 189: /* now scan the buffer and build pointer array */
! 190:
! 191: iline = 1;
! 192: i_ptr[iline] = i_womp;
! 193: for (s=i_womp; *s; s++) {
! 194: if (*s == '\n')
! 195: i_ptr[++iline] = s+1; /* these are NOT null terminated */
! 196: }
! 197: input_lines = iline - 1;
! 198:
! 199: /* now check for revision, if any */
! 200:
! 201: if (revision != Nullch) {
! 202: if (!rev_in_string(i_womp)) {
! 203: if (force) {
! 204: if (verbose)
! 205: say2(
! 206: "Warning: this file doesn't appear to be the %s version--patching anyway.\n",
! 207: revision);
! 208: }
! 209: else if (batch) {
! 210: fatal2(
! 211: "this file doesn't appear to be the %s version--aborting.\n", revision);
! 212: }
! 213: else {
! 214: ask2(
! 215: "This file doesn't appear to be the %s version--patch anyway? [n] ",
! 216: revision);
! 217: if (*buf != 'y')
! 218: fatal1("aborted\n");
! 219: }
! 220: }
! 221: else if (verbose)
! 222: say2("Good. This file appears to be the %s version.\n",
! 223: revision);
! 224: }
! 225: return TRUE; /* plan a will work */
! 226: }
! 227:
! 228: /* Keep (virtually) nothing in memory. */
! 229:
! 230: void
! 231: plan_b(filename)
! 232: char *filename;
! 233: {
! 234: Reg3 FILE *ifp;
! 235: Reg1 int i = 0;
! 236: Reg2 int maxlen = 1;
! 237: Reg4 bool found_revision = (revision == Nullch);
! 238:
! 239: using_plan_a = FALSE;
! 240: if ((ifp = fopen(filename, "r")) == Nullfp)
! 241: pfatal2("can't open file %s", filename);
! 242: if ((tifd = creat(TMPINNAME, 0666)) < 0)
! 243: pfatal2("can't open file %s", TMPINNAME);
! 244: while (fgets(buf, sizeof buf, ifp) != Nullch) {
! 245: if (revision != Nullch && !found_revision && rev_in_string(buf))
! 246: found_revision = TRUE;
! 247: if ((i = strlen(buf)) > maxlen)
! 248: maxlen = i; /* find longest line */
! 249: }
! 250: if (revision != Nullch) {
! 251: if (!found_revision) {
! 252: if (force) {
! 253: if (verbose)
! 254: say2(
! 255: "Warning: this file doesn't appear to be the %s version--patching anyway.\n",
! 256: revision);
! 257: }
! 258: else if (batch) {
! 259: fatal2(
! 260: "this file doesn't appear to be the %s version--aborting.\n", revision);
! 261: }
! 262: else {
! 263: ask2(
! 264: "This file doesn't appear to be the %s version--patch anyway? [n] ",
! 265: revision);
! 266: if (*buf != 'y')
! 267: fatal1("aborted\n");
! 268: }
! 269: }
! 270: else if (verbose)
! 271: say2("Good. This file appears to be the %s version.\n",
! 272: revision);
! 273: }
! 274: Fseek(ifp, 0L, 0); /* rewind file */
! 275: lines_per_buf = BUFFERSIZE / maxlen;
! 276: tireclen = maxlen;
! 277: tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
! 278: tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
! 279: if (tibuf[1] == Nullch)
! 280: fatal1("out of memory\n");
! 281: for (i=1; ; i++) {
! 282: if (! (i % lines_per_buf)) /* new block */
! 283: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
! 284: pfatal1("can't write temp file");
! 285: if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp)
! 286: == Nullch) {
! 287: input_lines = i - 1;
! 288: if (i % lines_per_buf)
! 289: if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
! 290: pfatal1("can't write temp file");
! 291: break;
! 292: }
! 293: }
! 294: Fclose(ifp);
! 295: Close(tifd);
! 296: if ((tifd = open(TMPINNAME, 0)) < 0) {
! 297: pfatal2("can't reopen file %s", TMPINNAME);
! 298: }
! 299: }
! 300:
! 301: /* Fetch a line from the input file, \n terminated, not necessarily \0. */
! 302:
! 303: char *
! 304: ifetch(line,whichbuf)
! 305: Reg1 LINENUM line;
! 306: int whichbuf; /* ignored when file in memory */
! 307: {
! 308: if (line < 1 || line > input_lines)
! 309: return "";
! 310: if (using_plan_a)
! 311: return i_ptr[line];
! 312: else {
! 313: LINENUM offline = line % lines_per_buf;
! 314: LINENUM baseline = line - offline;
! 315:
! 316: if (tiline[0] == baseline)
! 317: whichbuf = 0;
! 318: else if (tiline[1] == baseline)
! 319: whichbuf = 1;
! 320: else {
! 321: tiline[whichbuf] = baseline;
! 322: #ifndef lint /* complains of long accuracy */
! 323: Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0);
! 324: #endif
! 325: if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
! 326: pfatal2("error reading tmp file %s", TMPINNAME);
! 327: }
! 328: return tibuf[whichbuf] + (tireclen*offline);
! 329: }
! 330: }
! 331:
! 332: /* True if the string argument contains the revision number we want. */
! 333:
! 334: bool
! 335: rev_in_string(string)
! 336: char *string;
! 337: {
! 338: Reg1 char *s;
! 339: Reg2 int patlen;
! 340:
! 341: if (revision == Nullch)
! 342: return TRUE;
! 343: patlen = strlen(revision);
! 344: if (strnEQ(string,revision,patlen) && isspace(string[patlen]))
! 345: return TRUE;
! 346: for (s = string; *s; s++) {
! 347: if (isspace(*s) && strnEQ(s+1, revision, patlen) &&
! 348: isspace(s[patlen+1] )) {
! 349: return TRUE;
! 350: }
! 351: }
! 352: return FALSE;
! 353: }
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