Move commands into "posix", "lsb", and "other" menus/directories.

1 files changed, 412 insertions, 0 deletions

diff --git a/toys/posix/patch.c b/toys/posix/patch.c
new file mode 100644
index 00000000..647bb18f
--- /dev/null
+++ b/toys/posix/patch.c
@@ -0,0 +1,412 @@
+/* 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, USE_TOYBOX_DEBUG("x")"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 "toys.h"
+
+DEFINE_GLOBALS(
+	char *infile;
+	long prefix;
+
+	struct double_list *current_hunk;
+	long oldline, oldlen, newline, newlen;
+	long linenum;
+	int context, state, filein, fileout, filepatch, hunknum;
+	char *tempname;
+)
+
+#define TT this.patch
+
+#define FLAG_REVERSE 1
+#define FLAG_PATHLEN 4
+
+// 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
+
+#define PATCH_DEBUG (CFG_TOYBOX_DEBUG && (toys.optflags & 16))
+
+static void do_line(void *data)
+{
+	struct double_list *dlist = (struct double_list *)data;
+
+	if (TT.state>1 && *dlist->data != TT.state) {
+		char *s = dlist->data+(TT.state>3 ? 1 : 0);
+		int i = TT.state == 2 ? 2 : TT.fileout;
+
+		xwrite(i, s, strlen(s));
+		xwrite(i, "\n", 1);
+	}
+
+	if (PATCH_DEBUG) fprintf(stderr, "DO %d: %s\n", TT.state, dlist->data);
+
+	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.current_hunk) return;
+	TT.current_hunk->prev->next = 0;
+
+	fprintf(stderr, "Hunk %d FAILED %ld/%ld.\n",
+			TT.hunknum, TT.oldline, TT.newline);
+	toys.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;
+	llist_traverse(TT.current_hunk, do_line);
+	TT.current_hunk = NULL;
+	delete_tempfile(TT.filein, TT.fileout, &TT.tempname);
+	TT.state = 0;
+}
+
+// Given a hunk of a unified diff, make the appropriate change to the file.
+// This does not use the location information, but instead treats a hunk
+// as a sort of regex.  Copies data from input to output until it finds
+// the change to be made, then outputs the changed data and returns.
+// (Finding EOF first is an error.)  This is a single pass operation, so
+// multiple hunks must occur in order in the file.
+
+static int apply_one_hunk(void)
+{
+	struct double_list *plist, *buf = NULL, *check;
+	int matcheof = 0, reverse = toys.optflags & FLAG_REVERSE, backwarn = 0;
+
+	// Break doubly linked list so we can use singly linked traversal function.
+	TT.current_hunk->prev->next = NULL;
+
+	// Match EOF if there aren't as many ending context lines as beginning
+	for (plist = TT.current_hunk; plist; plist = plist->next) {
+		if (plist->data[0]==' ') matcheof++;
+		else matcheof = 0;
+		if (PATCH_DEBUG) fprintf(stderr, "HUNK:%s\n", plist->data);
+	}
+	matcheof = matcheof < TT.context;
+
+	if (PATCH_DEBUG) fprintf(stderr,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
+
+	// Loop through input data searching for this hunk.  Match all context
+	// lines and all lines to be removed until we've found the end of a
+	// complete hunk.
+	plist = TT.current_hunk;
+	buf = NULL;
+	if (TT.context) for (;;) {
+		char *data = get_line(TT.filein);
+
+		TT.linenum++;
+
+		// Figure out which line of hunk to compare with next.  (Skip lines
+		// of the hunk we'd be adding.)
+		while (plist && *plist->data == "+-"[reverse]) {
+			if (data && !strcmp(data, plist->data+1)) {
+				if (!backwarn) backwarn = TT.linenum;
+			}
+			plist = plist->next;
+		}
+
+		// Is this EOF?
+		if (!data) {
+			if (PATCH_DEBUG) fprintf(stderr, "INEOF\n");
+
+			// Does this hunk need to match EOF?
+			if (!plist && matcheof) break;
+
+			if (backwarn)
+				fprintf(stderr, "Possibly reversed hunk %d at %ld\n",
+						TT.hunknum, TT.linenum);
+
+			// File ended before we found a place for this hunk.
+			fail_hunk();
+			goto done;
+		} else if (PATCH_DEBUG) fprintf(stderr, "IN: %s\n", data);
+		check = dlist_add(&buf, data);
+
+		// Compare this line with next expected line of hunk.
+		// todo: teach the strcmp() to ignore whitespace.
+
+		// A match can fail because the next line doesn't match, or because
+		// we hit the end of a hunk that needed EOF, and this isn't EOF.
+
+		// If match failed, flush first line of buffered data and
+		// recheck buffered data for a new match until we find one or run
+		// out of buffer.
+
+		for (;;) {
+			if (!plist || strcmp(check->data, plist->data+1)) {
+				// Match failed.  Write out first line of buffered data and
+				// recheck remaining buffered data for a new match.
+	
+				if (PATCH_DEBUG)
+					fprintf(stderr, "NOT: %s\n", plist->data);
+
+				TT.state = 3;
+				check = llist_pop(&buf);
+				check->prev->next = buf;
+				buf->prev = check->prev;
+				do_line(check);
+				plist = TT.current_hunk;
+
+				// If we've reached the end of the buffer without confirming a
+				// match, read more lines.
+				if (check==buf) {
+					buf = 0;
+					break;
+				}
+				check = buf;
+			} else {
+				if (PATCH_DEBUG)
+					fprintf(stderr, "MAYBE: %s\n", plist->data);
+				// This line matches.  Advance plist, detect successful match.
+				plist = plist->next;
+				if (!plist && !matcheof) goto out;
+				check = check->next;
+				if (check == buf) break;
+			}
+		}
+	}
+out:
+	// We have a match.  Emit changed data.
+	TT.state = "-+"[reverse];
+	llist_traverse(TT.current_hunk, do_line);
+	TT.current_hunk = NULL;
+	TT.state = 1;
+done:
+	if (buf) {
+		buf->prev->next = NULL;
+		llist_traverse(buf, do_line);
+	}
+
+	return TT.state;
+}
+
+// Read a patch file and find hunks, opening/creating/deleting files.
+// Call apply_one_hunk() on each hunk.
+
+// 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
+
+void patch_main(void)
+{
+	int reverse = toys.optflags&FLAG_REVERSE, state = 0, patchlinenum = 0,
+		strip = 0;
+	char *oldname = NULL, *newname = NULL;
+
+	if (TT.infile) TT.filepatch = xopen(TT.infile, O_RDONLY);
+	TT.filein = TT.fileout = -1;
+
+	// Loop through the lines in the patch
+	for (;;) {
+		char *patchline;
+
+		patchline = get_line(TT.filepatch);
+		if (!patchline) break;
+
+		// Other versions of patch accept damaged patches,
+		// so we need to also.
+		if (strip || !patchlinenum++) {
+			int len = strlen(patchline);
+			if (patchline[len-1] == '\r') {
+				if (!strip) fprintf(stderr, "Removing DOS newlines\n");
+				strip = 1;
+				patchline[len-1]=0;
+			}
+		}
+		if (!*patchline) {
+			free(patchline);
+			patchline = xstrdup(" ");
+		}
+
+		// Are we assembling a hunk?
+		if (state >= 2) {
+			if (*patchline==' ' || *patchline=='+' || *patchline=='-') {
+				dlist_add(&TT.current_hunk, patchline);
+
+				if (*patchline != '+') TT.oldlen--;
+				if (*patchline != '-') TT.newlen--;
+
+				// Context line?
+				if (*patchline==' ' && state==2) TT.context++;
+				else state=3;
+
+				// If we've consumed all expected hunk lines, apply the hunk.
+
+				if (!TT.oldlen && !TT.newlen) state = apply_one_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>1900 && 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?  Usually @@ -oldline,oldlen +newline,newlen @@
+		// but a missing ,value means the value is 1.
+		} else if (state == 1 && !strncmp("@@ -", patchline, 4)) {
+			int i;
+			char *s = patchline+4;
+
+			// Read oldline[,oldlen] +newline[,newlen]
+
+			TT.oldlen = TT.newlen = 1;
+			TT.oldline = strtol(s, &s, 10);
+			if (*s == ',') TT.oldlen=strtol(s+1, &s, 10);
+			TT.newline = strtol(s+2, &s, 10);
+			if (*s == ',') TT.newlen = strtol(s+1, &s, 10);
+
+			TT.context = 0;
+			state = 2;
+
+			// If this is the first hunk, open the file.
+			if (TT.filein == -1) {
+				int oldsum, newsum, del = 0;
+				char *name;
+
+ 				oldsum = TT.oldline + TT.oldlen;
+				newsum = TT.newline + TT.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 ((toys.optflags & FLAG_PATHLEN) && TT.prefix == i) break;
+					if (*s++ != '/') continue;
+					while (*s == '/') 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 (!(toys.optflags & FLAG_PATHLEN) || i <= TT.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 = xcreate(name, O_CREAT|O_EXCL|O_RDWR, 0666);
+					} else {
+						printf("patching %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 (CFG_TOYBOX_FREE) {
+		close(TT.filepatch);
+		free(oldname);
+		free(newname);
+	}
+}