/* $Header: /cvsroot/src/usr.bin/patch/inp.c,v 1.1 1993/04/09 11:34:00 cgd Exp $ * * $Log: inp.c,v $ * Revision 1.1 1993/04/09 11:34:00 cgd * patch 2.0.12u8, from prep.ai.mit.edu. this is not under the GPL. * * Revision 2.0.1.1 88/06/03 15:06:13 lwall * patch10: made a little smarter about sccs files * * Revision 2.0 86/09/17 15:37:02 lwall * Baseline for netwide release. * */ #include "EXTERN.h" #include "common.h" #include "util.h" #include "pch.h" #include "INTERN.h" #include "inp.h" /* Input-file-with-indexable-lines abstract type */ static long i_size; /* size of the input file */ static char *i_womp; /* plan a buffer for entire file */ static char **i_ptr; /* pointers to lines in i_womp */ static int tifd = -1; /* plan b virtual string array */ static char *tibuf[2]; /* plan b buffers */ static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */ static LINENUM lines_per_buf; /* how many lines per buffer */ static int tireclen; /* length of records in tmp file */ /* New patch--prepare to edit another file. */ void re_input() { if (using_plan_a) { i_size = 0; #ifndef lint if (i_ptr != Null(char**)) free((char *)i_ptr); #endif if (i_womp != Nullch) free(i_womp); i_womp = Nullch; i_ptr = Null(char **); } else { using_plan_a = TRUE; /* maybe the next one is smaller */ Close(tifd); tifd = -1; free(tibuf[0]); free(tibuf[1]); tibuf[0] = tibuf[1] = Nullch; tiline[0] = tiline[1] = -1; tireclen = 0; } } /* Constuct the line index, somehow or other. */ void scan_input(filename) char *filename; { if (!plan_a(filename)) plan_b(filename); if (verbose) { say3("Patching file %s using Plan %s...\n", filename, (using_plan_a ? "A" : "B") ); } } /* Try keeping everything in memory. */ bool plan_a(filename) char *filename; { int ifd, statfailed; Reg1 char *s; Reg2 LINENUM iline; char lbuf[MAXLINELEN]; statfailed = stat(filename, &filestat); if (statfailed && ok_to_create_file) { if (verbose) say2("(Creating file %s...)\n",filename); makedirs(filename, TRUE); close(creat(filename, 0666)); statfailed = stat(filename, &filestat); } /* For nonexistent or read-only files, look for RCS or SCCS versions. */ if (statfailed /* No one can write to it. */ || (filestat.st_mode & 0222) == 0 /* I can't write to it. */ || ((filestat.st_mode & 0022) == 0 && filestat.st_uid != myuid)) { struct stat cstat; char *cs = Nullch; char *filebase; int pathlen; filebase = basename(filename); pathlen = filebase - filename; /* Put any leading path into `s'. Leave room in lbuf for the diff command. */ s = lbuf + 20; strncpy(s, filename, pathlen); #define try(f, a1, a2) (Sprintf(s + pathlen, f, a1, a2), stat(s, &cstat) == 0) if ( try("RCS/%s%s", filebase, RCSSUFFIX) || try("RCS/%s" , filebase, 0) || try( "%s%s", filebase, RCSSUFFIX)) { Sprintf(buf, CHECKOUT, filename); Sprintf(lbuf, RCSDIFF, filename); cs = "RCS"; } else if ( try("SCCS/%s%s", SCCSPREFIX, filebase) || try( "%s%s", SCCSPREFIX, filebase)) { Sprintf(buf, GET, s); Sprintf(lbuf, SCCSDIFF, s, filename); cs = "SCCS"; } else if (statfailed) fatal2("can't find %s\n", filename); /* else we can't write to it but it's not under a version control system, so just proceed. */ if (cs) { if (!statfailed) { if ((filestat.st_mode & 0222) != 0) /* The owner can write to it. */ fatal3("file %s seems to be locked by somebody else under %s\n", filename, cs); /* It might be checked out unlocked. See if it's safe to check out the default version locked. */ if (verbose) say3("Comparing file %s to default %s version...\n", filename, cs); if (system(lbuf)) fatal3("can't check out file %s: differs from default %s version\n", filename, cs); } if (verbose) say3("Checking out file %s from %s...\n", filename, cs); if (system(buf) || stat(filename, &filestat)) fatal3("can't check out file %s from %s\n", filename, cs); } } filemode = filestat.st_mode; if (!S_ISREG(filemode)) fatal2("%s is not a normal file--can't patch\n", filename); i_size = filestat.st_size; if (out_of_mem) { set_hunkmax(); /* make sure dynamic arrays are allocated */ out_of_mem = FALSE; return FALSE; /* force plan b because plan a bombed */ } #ifdef lint i_womp = Nullch; #else i_womp = malloc((MEM)(i_size+2)); /* lint says this may alloc less than */ /* i_size, but that's okay, I think. */ #endif if (i_womp == Nullch) return FALSE; if ((ifd = open(filename, 0)) < 0) pfatal2("can't open file %s", filename); #ifndef lint if (read(ifd, i_womp, (int)i_size) != i_size) { Close(ifd); /* probably means i_size > 15 or 16 bits worth */ free(i_womp); /* at this point it doesn't matter if i_womp was */ return FALSE; /* undersized. */ } #endif Close(ifd); if (i_size && i_womp[i_size-1] != '\n') i_womp[i_size++] = '\n'; i_womp[i_size] = '\0'; /* count the lines in the buffer so we know how many pointers we need */ iline = 0; for (s=i_womp; *s; s++) { if (*s == '\n') iline++; } #ifdef lint i_ptr = Null(char**); #else i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *))); #endif if (i_ptr == Null(char **)) { /* shucks, it was a near thing */ free((char *)i_womp); return FALSE; } /* now scan the buffer and build pointer array */ iline = 1; i_ptr[iline] = i_womp; for (s=i_womp; *s; s++) { if (*s == '\n') i_ptr[++iline] = s+1; /* these are NOT null terminated */ } input_lines = iline - 1; /* now check for revision, if any */ if (revision != Nullch) { if (!rev_in_string(i_womp)) { if (force) { if (verbose) say2( "Warning: this file doesn't appear to be the %s version--patching anyway.\n", revision); } else if (batch) { fatal2( "this file doesn't appear to be the %s version--aborting.\n", revision); } else { ask2( "This file doesn't appear to be the %s version--patch anyway? [n] ", revision); if (*buf != 'y') fatal1("aborted\n"); } } else if (verbose) say2("Good. This file appears to be the %s version.\n", revision); } return TRUE; /* plan a will work */ } /* Keep (virtually) nothing in memory. */ void plan_b(filename) char *filename; { Reg3 FILE *ifp; Reg1 int i = 0; Reg2 int maxlen = 1; Reg4 bool found_revision = (revision == Nullch); using_plan_a = FALSE; if ((ifp = fopen(filename, "r")) == Nullfp) pfatal2("can't open file %s", filename); if ((tifd = creat(TMPINNAME, 0666)) < 0) pfatal2("can't open file %s", TMPINNAME); while (fgets(buf, sizeof buf, ifp) != Nullch) { if (revision != Nullch && !found_revision && rev_in_string(buf)) found_revision = TRUE; if ((i = strlen(buf)) > maxlen) maxlen = i; /* find longest line */ } if (revision != Nullch) { if (!found_revision) { if (force) { if (verbose) say2( "Warning: this file doesn't appear to be the %s version--patching anyway.\n", revision); } else if (batch) { fatal2( "this file doesn't appear to be the %s version--aborting.\n", revision); } else { ask2( "This file doesn't appear to be the %s version--patch anyway? [n] ", revision); if (*buf != 'y') fatal1("aborted\n"); } } else if (verbose) say2("Good. This file appears to be the %s version.\n", revision); } Fseek(ifp, 0L, 0); /* rewind file */ lines_per_buf = BUFFERSIZE / maxlen; tireclen = maxlen; tibuf[0] = malloc((MEM)(BUFFERSIZE + 1)); tibuf[1] = malloc((MEM)(BUFFERSIZE + 1)); if (tibuf[1] == Nullch) fatal1("out of memory\n"); for (i=1; ; i++) { if (! (i % lines_per_buf)) /* new block */ if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) pfatal1("can't write temp file"); if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp) == Nullch) { input_lines = i - 1; if (i % lines_per_buf) if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE) pfatal1("can't write temp file"); break; } } Fclose(ifp); Close(tifd); if ((tifd = open(TMPINNAME, 0)) < 0) { pfatal2("can't reopen file %s", TMPINNAME); } } /* Fetch a line from the input file, \n terminated, not necessarily \0. */ char * ifetch(line,whichbuf) Reg1 LINENUM line; int whichbuf; /* ignored when file in memory */ { if (line < 1 || line > input_lines) return ""; if (using_plan_a) return i_ptr[line]; else { LINENUM offline = line % lines_per_buf; LINENUM baseline = line - offline; if (tiline[0] == baseline) whichbuf = 0; else if (tiline[1] == baseline) whichbuf = 1; else { tiline[whichbuf] = baseline; #ifndef lint /* complains of long accuracy */ Lseek(tifd, (long)baseline / lines_per_buf * BUFFERSIZE, 0); #endif if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0) pfatal2("error reading tmp file %s", TMPINNAME); } return tibuf[whichbuf] + (tireclen*offline); } } /* True if the string argument contains the revision number we want. */ bool rev_in_string(string) char *string; { Reg1 char *s; Reg2 int patlen; if (revision == Nullch) return TRUE; patlen = strlen(revision); if (strnEQ(string,revision,patlen) && isspace(string[patlen])) return TRUE; for (s = string; *s; s++) { if (isspace(*s) && strnEQ(s+1, revision, patlen) && isspace(s[patlen+1] )) { return TRUE; } } return FALSE; }