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| -rw-r--r-- | editors/patch_toybox.c | 559 |
1 files changed, 559 insertions, 0 deletions
diff --git a/editors/patch_toybox.c b/editors/patch_toybox.c new file mode 100644 index 0000000..f1e0de6 --- /dev/null +++ b/editors/patch_toybox.c @@ -0,0 +1,559 @@ +/* Adapted from toybox's patch. Currently unused */ + +/* vi: set sw=4 ts=4: + * + * patch.c - Apply a "universal" diff. + * + * Copyright 2007 Rob Landley <rob@landley.net> + * + * see http://www.opengroup.org/onlinepubs/009695399/utilities/patch.html + * (But only does -u, because who still cares about "ed"?) + * + * TODO: + * -b backup + * -l treat all whitespace as a single space + * -N ignore already applied + * -d chdir first + * -D define wrap #ifdef and #ifndef around changes + * -o outfile output here instead of in place + * -r rejectfile write rejected hunks to this file + * + * -E remove empty files --remove-empty-files + * -f force (no questions asked) + * -F fuzz (number, default 2) + * [file] which file to patch + +USE_PATCH(NEWTOY(patch, "up#i:R", TOYFLAG_USR|TOYFLAG_BIN)) + +config PATCH + bool "patch" + default y + help + usage: patch [-i file] [-p depth] [-Ru] + + Apply a unified diff to one or more files. + + -i Input file (defaults=stdin) + -p number of '/' to strip from start of file paths (default=all) + -R Reverse patch. + -u Ignored (only handles "unified" diffs) + + This version of patch only handles unified diffs, and only modifies + a file when all all hunks to that file apply. Patch prints failed + hunks to stderr, and exits with nonzero status if any hunks fail. + + A file compared against /dev/null (or with a date <= the epoch) is + created/deleted as appropriate. +*/ +#include "libbb.h" + +struct double_list { + struct double_list *next; + struct double_list *prev; + char *data; +}; + +// Return the first item from the list, advancing the list (which must be called +// as &list) +static +void *TOY_llist_pop(void *list) +{ + // I'd use a void ** for the argument, and even accept the typecast in all + // callers as documentation you need the &, except the stupid compiler + // would then scream about type-punned pointers. Screw it. + void **llist = (void **)list; + void **next = (void **)*llist; + *llist = *next; + + return (void *)next; +} + +// Free all the elements of a linked list +// if freeit!=NULL call freeit() on each element before freeing it. +static +void TOY_llist_free(void *list, void (*freeit)(void *data)) +{ + while (list) { + void *pop = TOY_llist_pop(&list); + if (freeit) freeit(pop); + else free(pop); + + // End doubly linked list too. + if (list==pop) break; + } +} + +// Add an entry to the end off a doubly linked list +static +struct double_list *dlist_add(struct double_list **list, char *data) +{ + struct double_list *line = xmalloc(sizeof(struct double_list)); + + line->data = data; + if (*list) { + line->next = *list; + line->prev = (*list)->prev; + (*list)->prev->next = line; + (*list)->prev = line; + } else *list = line->next = line->prev = line; + + return line; +} + +// Ensure entire path exists. +// If mode != -1 set permissions on newly created dirs. +// Requires that path string be writable (for temporary null terminators). +static +void xmkpath(char *path, int mode) +{ + char *p, old; + mode_t mask; + int rc; + struct stat st; + + for (p = path; ; p++) { + if (!*p || *p == '/') { + old = *p; + *p = rc = 0; + if (stat(path, &st) || !S_ISDIR(st.st_mode)) { + if (mode != -1) { + mask = umask(0); + rc = mkdir(path, mode); + umask(mask); + } else rc = mkdir(path, 0777); + } + *p = old; + if(rc) bb_perror_msg_and_die("mkpath '%s'", path); + } + if (!*p) break; + } +} + +// Slow, but small. +static +char *get_rawline(int fd, long *plen, char end) +{ + char c, *buf = NULL; + long len = 0; + + for (;;) { + if (1>read(fd, &c, 1)) break; + if (!(len & 63)) buf=xrealloc(buf, len+65); + if ((buf[len++]=c) == end) break; + } + if (buf) buf[len]=0; + if (plen) *plen = len; + + return buf; +} + +static +char *get_line(int fd) +{ + long len; + char *buf = get_rawline(fd, &len, '\n'); + + if (buf && buf[--len]=='\n') buf[len]=0; + + return buf; +} + +// Copy the rest of in to out and close both files. +static +void xsendfile(int in, int out) +{ + long len; + char buf[4096]; + + if (in<0) return; + for (;;) { + len = safe_read(in, buf, 4096); + if (len<1) break; + xwrite(out, buf, len); + } +} + +// Copy the rest of the data and replace the original with the copy. +static +void replace_tempfile(int fdin, int fdout, char **tempname) +{ + char *temp = xstrdup(*tempname); + + temp[strlen(temp)-6]=0; + if (fdin != -1) { + xsendfile(fdin, fdout); + xclose(fdin); + } + xclose(fdout); + rename(*tempname, temp); + free(*tempname); + free(temp); + *tempname = NULL; +} + +// Open a temporary file to copy an existing file into. +static +int copy_tempfile(int fdin, char *name, char **tempname) +{ + struct stat statbuf; + int fd; + + *tempname = xasprintf("%sXXXXXX", name); + fd = mkstemp(*tempname); + if(-1 == fd) bb_perror_msg_and_die("no temp file"); + + // Set permissions of output file + fstat(fdin, &statbuf); + fchmod(fd, statbuf.st_mode); + + return fd; +} + +// Abort the copy and delete the temporary file. +static +void delete_tempfile(int fdin, int fdout, char **tempname) +{ + close(fdin); + close(fdout); + unlink(*tempname); + free(*tempname); + *tempname = NULL; +} + + + +struct globals { + struct double_list *plines; + long linenum; + int context; + int hunknum; + int filein; + int fileout; + int state; + char *tempname; + smallint exitval; +}; +#define TT (*ptr_to_globals) +#define INIT_TT() do { \ + SET_PTR_TO_GLOBALS(xzalloc(sizeof(TT))); \ +} while (0) + + +//bbox had: "p:i:RN" +#define FLAG_STR "Rup:i:" +/* FLAG_REVERSE must be == 1! Code uses this fact. */ +#define FLAG_REVERSE (1 << 0) +#define FLAG_u (1 << 1) +#define FLAG_PATHLEN (1 << 2) +#define FLAG_INPUT (1 << 3) + +// Dispose of a line of input, either by writing it out or discarding it. + +// state < 2: just free +// state = 2: write whole line to stderr +// state = 3: write whole line to fileout +// state > 3: write line+1 to fileout when *line != state + +static void do_line(void *data) +{ + struct double_list *dlist = (struct double_list *)data; + + if (TT.state>1 && *dlist->data != TT.state) + fdprintf(TT.state == 2 ? 2 : TT.fileout, + "%s\n", dlist->data+(TT.state>3 ? 1 : 0)); + + free(dlist->data); + free(data); +} + +static void finish_oldfile(void) +{ + if (TT.tempname) replace_tempfile(TT.filein, TT.fileout, &TT.tempname); + TT.fileout = TT.filein = -1; +} + +static void fail_hunk(void) +{ + if (!TT.plines) return; + TT.plines->prev->next = 0; + + fdprintf(2, "Hunk %d FAILED.\n", TT.hunknum); + TT.exitval = 1; + + // If we got to this point, we've seeked to the end. Discard changes to + // this file and advance to next file. + + TT.state = 2; + TOY_llist_free(TT.plines, do_line); + TT.plines = NULL; + delete_tempfile(TT.filein, TT.fileout, &TT.tempname); + TT.state = 0; +} + +static int apply_hunk(void) +{ + struct double_list *plist, *buf = NULL, *check; + int i = 0, backwards = 0, matcheof = 0, + reverse = option_mask32 & FLAG_REVERSE; + + // Break doubly linked list so we can use singly linked traversal function. + TT.plines->prev->next = NULL; + + // Match EOF if there aren't as many ending context lines as beginning + for (plist = TT.plines; plist; plist = plist->next) { + if (plist->data[0]==' ') i++; + else i = 0; + } + if (i < TT.context) matcheof++; + + // Search for a place to apply this hunk. Match all context lines and + // lines to be removed. + plist = TT.plines; + buf = NULL; + i = 0; + + // Start of for loop + if (TT.context) for (;;) { + char *data = get_line(TT.filein); + + TT.linenum++; + + // Skip lines of the hunk we'd be adding. + while (plist && *plist->data == "+-"[reverse]) { + if (data && !strcmp(data, plist->data+1)) { + if (++backwards == TT.context) + fdprintf(2,"Possibly reversed hunk %d at %ld\n", + TT.hunknum, TT.linenum); + } else backwards=0; + plist = plist->next; + } + + // Is this EOF? + if (!data) { + // Does this hunk need to match EOF? + if (!plist && matcheof) break; + + // File ended before we found a place for this hunk. + fail_hunk(); + goto done; + } + check = dlist_add(&buf, data); + + // todo: teach the strcmp() to ignore whitespace. + + for (;;) { + // If we hit the end of a hunk that needed EOF and this isn't EOF, + // or next line doesn't match, flush first line of buffered data and + // recheck match until we find a new match or run out of buffer. + + if (!plist || strcmp(check->data, plist->data+1)) { + // First line isn't a match, write it out. + TT.state = 3; + check = TOY_llist_pop(&buf); + check->prev->next = buf; + buf->prev = check->prev; + do_line(check); + plist = TT.plines; + + // Out of buffered lines? + if (check==buf) { + buf = 0; + break; + } + check = buf; + } else { + // This line matches. Advance plist, detect successful match. + plist = plist->next; + if (!plist && !matcheof) goto out; + check = check->next; + if (check == buf) break; + } + } + } +out: + // Got it. Emit changed data. + TT.state = "-+"[reverse]; + TOY_llist_free(TT.plines, do_line); + TT.plines = NULL; + TT.state = 1; +done: + if (buf) { + buf->prev->next = NULL; + TOY_llist_free(buf, do_line); + } + + return TT.state; +} + +// state 0: Not in a hunk, look for +++. +// state 1: Found +++ file indicator, look for @@ +// state 2: In hunk: counting initial context lines +// state 3: In hunk: getting body + +int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int patch_main(int argc UNUSED_PARAM, char **argv) +{ + int opts; + int reverse, state = 0; + char *oldname = NULL, *newname = NULL; + char *opt_p, *opt_i; + int prefix; + + long oldline = 0, oldlen = 0, newline = 0, newlen = 0; + + INIT_TT(); + + opts = getopt32(argv, FLAG_STR, &opt_p, &opt_i); + reverse = opts & FLAG_REVERSE; + + if (opts & FLAG_INPUT) xmove_fd(xopen(opt_i, O_RDONLY), STDIN_FILENO); + prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative! + TT.filein = TT.fileout = -1; + + // Loop through the lines in the patch + for(;;) { + char *patchline; + + patchline = get_line(STDIN_FILENO); + if (!patchline) break; + + // Other versions of patch accept damaged patches, + // so we need to also. + if (!*patchline) { + free(patchline); + patchline = xstrdup(" "); + } + + // Are we assembling a hunk? + if (state >= 2) { + if (*patchline==' ' || *patchline=='+' || *patchline=='-') { + dlist_add(&TT.plines, patchline); + + if (*patchline != '+') oldlen--; + if (*patchline != '-') newlen--; + + // Context line? + if (*patchline==' ' && state==2) TT.context++; + else state=3; + + // If we've consumed all expected hunk lines, apply the hunk. + if (!oldlen && !newlen) state = apply_hunk(); + continue; + } + fail_hunk(); + state = 0; + continue; + } + + // Open a new file? + if (!strncmp("--- ", patchline, 4) || !strncmp("+++ ", patchline, 4)) { + char *s, **name = &oldname; + int i; + + if (*patchline == '+') { + name = &newname; + state = 1; + } + + free(*name); + finish_oldfile(); + + // Trim date from end of filename (if any). We don't care. + for (s = patchline+4; *s && *s!='\t'; s++) + if (*s=='\\' && s[1]) s++; + i = atoi(s); + if (i && i<=1970) + *name = xstrdup("/dev/null"); + else { + *s = 0; + *name = xstrdup(patchline+4); + } + + // We defer actually opening the file because svn produces broken + // patches that don't signal they want to create a new file the + // way the patch man page says, so you have to read the first hunk + // and _guess_. + + // Start a new hunk? + } else if (state == 1 && !strncmp("@@ -", patchline, 4)) { + int i; + + i = sscanf(patchline+4, "%ld,%ld +%ld,%ld", + &oldline, &oldlen, &newline, &newlen); + if (i != 4) + bb_error_msg_and_die("corrupt hunk %d at %ld", TT.hunknum, TT.linenum); + + TT.context = 0; + state = 2; + + // If this is the first hunk, open the file. + if (TT.filein == -1) { + int oldsum, newsum, del = 0; + char *s, *name; + + oldsum = oldline + oldlen; + newsum = newline + newlen; + + name = reverse ? oldname : newname; + + // We're deleting oldname if new file is /dev/null (before -p) + // or if new hunk is empty (zero context) after patching + if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum)) { + name = reverse ? newname : oldname; + del++; + } + + // handle -p path truncation. + for (i=0, s = name; *s;) { + if ((option_mask32 & FLAG_PATHLEN) && prefix == i) + break; + if (*(s++)=='/') { + name = s; + i++; + } + } + + if (del) { + printf("removing %s\n", name); + xunlink(name); + state = 0; + // If we've got a file to open, do so. + } else if (!(option_mask32 & FLAG_PATHLEN) || i <= prefix) { + // If the old file was null, we're creating a new one. + if (!strcmp(oldname, "/dev/null") || !oldsum) { + printf("creating %s\n", name); + s = strrchr(name, '/'); + if (s) { + *s = 0; + xmkpath(name, -1); + *s = '/'; + } + TT.filein = xopen3(name, O_CREAT|O_EXCL|O_RDWR, 0666); + } else { + printf("patching file %s\n", name); + TT.filein = xopen(name, O_RDWR); + } + TT.fileout = copy_tempfile(TT.filein, name, &TT.tempname); + TT.linenum = 0; + TT.hunknum = 0; + } + } + + TT.hunknum++; + + continue; + } + + // If we didn't continue above, discard this line. + free(patchline); + } + + finish_oldfile(); + + if (ENABLE_FEATURE_CLEAN_UP) { + free(oldname); + free(newname); + } + + return TT.exitval; +} |