diff options
Diffstat (limited to 'gnu/usr.bin/patch/inp.c')
| -rw-r--r-- | gnu/usr.bin/patch/inp.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/gnu/usr.bin/patch/inp.c b/gnu/usr.bin/patch/inp.c new file mode 100644 index 0000000..d77ef65 --- /dev/null +++ b/gnu/usr.bin/patch/inp.c @@ -0,0 +1,397 @@ +/* $FreeBSD$ + * + * $Log: inp.c,v $ + * 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(void) +{ + 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(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(char *filename) +{ + int ifd, statfailed; + Reg1 char *s; + Reg2 LINENUM iline; + char lbuf[MAXLINELEN]; + int output_elsewhere = strcmp(filename, outname); + extern int check_patch; + + statfailed = stat(filename, &filestat); + if (statfailed && ok_to_create_file) { + if (verbose) + say2("(Creating file %s...)\n",filename); + if (check_patch) + return TRUE; + makedirs(filename, TRUE); + close(creat(filename, 0666)); + statfailed = stat(filename, &filestat); + } + if (statfailed && check_patch) { + fatal2("%s not found and in check_patch mode.", filename); + } + /* + * For nonexistent or read-only files, look for RCS or SCCS + * versions. + */ + if (statfailed || + (! output_elsewhere && + (/* 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%s", filebase, "") || + try("%s%s", filebase, RCSSUFFIX)) && + /* + * Check that RCS file is not working file. + * Some hosts don't report file name length errors. + */ + (statfailed || + ((filestat.st_dev ^ cstat.st_dev) | + (filestat.st_ino ^ cstat.st_ino)))) { + Sprintf(buf, output_elsewhere?CHECKOUT:CHECKOUT_LOCKED, filename); + Sprintf(lbuf, RCSDIFF, filename); + cs = "RCS"; + } else if (try("SCCS/%s%s", SCCSPREFIX, filebase) || + try("%s%s", SCCSPREFIX, filebase)) { + Sprintf(buf, output_elsewhere?GET:GET_LOCKED, 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 + /* + * Lint says this may alloc less than i_size, + * but that's okay, I think. + */ + i_womp = malloc((MEM)(i_size + 2)); +#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) { + /* + * This probably means i_size > 15 or 16 bits worth. At + * this point it doesn't matter if i_womp was undersized. + */ + Close(ifd); + free(i_womp); + return FALSE; + } +#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') { + /* These are NOT null terminated. */ + i_ptr[++iline] = s + 1; + } + } + 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 { + (void) 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(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 { + (void) 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(char *string) +{ + Reg1 char *s; + Reg2 int patlen; + + if (revision == Nullch) + return TRUE; + patlen = strlen(revision); + if (strnEQ(string,revision,patlen) && + isspace((unsigned char)string[patlen])) + return TRUE; + for (s = string; *s; s++) { + if (isspace((unsigned char)*s) && + strnEQ(s + 1, revision, patlen) && + isspace((unsigned char)s[patlen + 1] )) { + return TRUE; + } + } + return FALSE; +} |
