Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 359 insertions, 0 deletions

diff --git a/src/util/casefold.c b/src/util/casefold.c
new file mode 100644
index 0000000..d3ebd4b
--- /dev/null
+++ b/src/util/casefold.c
@@ -0,0 +1,359 @@
+/*++
+/* NAME
+/*	casefold 3
+/* SUMMARY
+/*	casefold text for caseless comparison
+/* SYNOPSIS
+/*	#include <stringops.h>
+/*
+/*	char	*casefold(
+/*	VSTRING *dst,
+/*	const char *src)
+/*
+/*	char	*casefold_append(
+/*	VSTRING *dst,
+/*	const char *src)
+/*
+/*	char	*casefold_len(
+/*	VSTRING *dst,
+/*	const char *src,
+/*	ssize_t	src_len)
+/* AUXILIARY FUNCTIONS
+/*	char	*casefoldx(
+/*	int	flags,
+/*	VSTRING *dst,
+/*	const char *src,
+/*	ssize_t	src_len)
+/* DESCRIPTION
+/*	casefold() converts text to a form that is suitable for
+/*	caseless comparison, rather than presentation to humans.
+/*
+/*	When compiled without EAI support or util_utf8_enable is
+/*	zero, casefold() implements ASCII case folding, leaving
+/*	non-ASCII byte values unchanged.
+/*
+/*	When compiled with EAI support and util_utf8_enable is
+/*	non-zero, casefold() implements UTF-8 case folding using
+/*	the en_US locale, as recommended when the conversion result
+/*	is not meant to be presented to humans.
+/*
+/*	casefold_len() implements casefold() with a source length
+/*	argument.
+/*
+/*	casefold_append() implements casefold() without overwriting
+/*	the result.
+/*
+/*	casefoldx() implements a more complex API that implements
+/*	all of the above and more.
+/*
+/*	Arguments:
+/* .IP src
+/*	Null-terminated input string.
+/* .IP dest
+/*	Output buffer, null-terminated. Specify a null pointer to
+/*	use an internal buffer that is overwritten upon each call.
+/* .IP src_len
+/*	The string length, -1 to determine the length dynamically.
+/* .IP flags
+/*	Bitwise OR of zero or more of the following:
+/* .RS
+/* .IP CASEF_FLAG_UTF8
+/*	Enable UTF-8 support. This flag has no effect when compiled
+/*	without EAI support.
+/* .IP CASEF_FLAG_APPEND
+/*	Append the result to the buffer, instead of overwriting it.
+/* DIAGNOSTICS
+/*	All errors are fatal. There appear to be no input-dependent
+/*	errors.
+/*
+/*	With the ICU 4.8 library, there is no casefold error for
+/*	UTF-8 code points U+0000..U+10FFFF (including surrogate
+/*	range), not even when running inside an empty chroot jail.
+/*	Nor does malformed UTF-8 trigger errors; non-UTF-8 bytes
+/*	are copied verbatim. Based on ICU 4.8 source-code review
+/*	and experimentation(!) we conclude that UTF-8 casefolding
+/*	has no data-dependent error cases, and that it is safe to
+/*	treat all casefolding errors as fatal runtime errors.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+#ifndef NO_EAI
+#include <unicode/ucasemap.h>
+#include <unicode/ustring.h>
+#include <unicode/uchar.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <stringops.h>
+
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+
+/* casefoldx - casefold an UTF-8 string */
+
+char   *casefoldx(int flags, VSTRING *dest, const char *src, ssize_t len)
+{
+    size_t  old_len;
+
+#ifdef NO_EAI
+
+    /*
+     * ASCII mode only.
+     */
+    if (len < 0)
+	len = strlen(src);
+    if ((flags & CASEF_FLAG_APPEND) == 0)
+	VSTRING_RESET(dest);
+    old_len = VSTRING_LEN(dest);
+    vstring_strncat(dest, src, len);
+    lowercase(STR(dest) + old_len);
+    return (STR(dest));
+#else
+
+    /*
+     * Unicode mode.
+     */
+    const char myname[] = "casefold";
+    static VSTRING *fold_buf = 0;
+    static UCaseMap *csm = 0;
+    UErrorCode error;
+    ssize_t space_needed;
+    int     n;
+
+    /*
+     * Handle special cases.
+     */
+    if (len < 0)
+	len = strlen(src);
+    if (dest == 0)
+	dest = (fold_buf != 0 ? fold_buf : (fold_buf = vstring_alloc(100)));
+    if ((flags & CASEF_FLAG_APPEND) == 0)
+	VSTRING_RESET(dest);
+    old_len = VSTRING_LEN(dest);
+
+    /*
+     * All-ASCII input, or ASCII mode only.
+     */
+    if ((flags & CASEF_FLAG_UTF8) == 0 || allascii(src)) {
+	vstring_strncat(dest, src, len);
+	lowercase(STR(dest) + old_len);
+	return (STR(dest));
+    }
+
+    /*
+     * ICU 4.8 ucasemap_utf8FoldCase() does not complain about UTF-8 syntax
+     * errors. XXX Based on source-code review we conclude that non-UTF-8
+     * bytes are copied verbatim, and experiments confirm this. Given that
+     * this behavior is intentional, we assume that it will stay that way.
+     */
+#if 0
+    if (valid_utf8_string(src, len) == 0) {
+	if (err)
+	    *err = "malformed UTF-8 or invalid codepoint";
+	return (0);
+    }
+#endif
+
+    /*
+     * One-time initialization. With ICU 4.8 this works while chrooted.
+     */
+    if (csm == 0) {
+	error = U_ZERO_ERROR;
+	csm = ucasemap_open("en_US", U_FOLD_CASE_DEFAULT, &error);
+	if (U_SUCCESS(error) == 0)
+	    msg_fatal("ucasemap_open error: %s", u_errorName(error));
+    }
+
+    /*
+     * Fold the input, adjusting the buffer size if needed. Safety: don't
+     * loop forever.
+     * 
+     * Note: the requested amount of space for casemapped output (as reported
+     * with space_needed below) does not include storage for the null
+     * terminator. The terminator is written only when the output buffer is
+     * large enough. This is why we overallocate space when the output does
+     * not fit. But if the output fits exactly, then the output will be
+     * unterminated, and we have to terminate the output ourselves.
+     */
+    for (n = 0; n < 3; n++) {
+	error = U_ZERO_ERROR;
+	space_needed = ucasemap_utf8FoldCase(csm, STR(dest) + old_len,
+				     vstring_avail(dest), src, len, &error);
+	if (U_SUCCESS(error)) {
+	    vstring_set_payload_size(dest, old_len + space_needed);
+	    if (vstring_avail(dest) == 0)	/* exact fit, no terminator */
+		VSTRING_TERMINATE(dest);	/* add terminator */
+	    break;
+	} else if (error == U_BUFFER_OVERFLOW_ERROR) {
+	    VSTRING_SPACE(dest, space_needed + 1);	/* for terminator */
+	} else {
+	    msg_fatal("%s: conversion error for \"%s\": %s",
+		      myname, src, u_errorName(error));
+	}
+    }
+    return (STR(dest));
+#endif						/* NO_EAI */
+}
+
+#ifdef TEST
+
+static void encode_utf8(VSTRING *buffer, int codepoint)
+{
+    const char myname[] = "encode_utf8";
+
+    VSTRING_RESET(buffer);
+    if (codepoint < 0x80) {
+	VSTRING_ADDCH(buffer, codepoint);
+    } else if (codepoint < 0x800) {
+	VSTRING_ADDCH(buffer, 0xc0 | (codepoint >> 6));
+	VSTRING_ADDCH(buffer, 0x80 | (codepoint & 0x3f));
+    } else if (codepoint < 0x10000) {
+	VSTRING_ADDCH(buffer, 0xe0 | (codepoint >> 12));
+	VSTRING_ADDCH(buffer, 0x80 | ((codepoint >> 6) & 0x3f));
+	VSTRING_ADDCH(buffer, 0x80 | (codepoint & 0x3f));
+    } else if (codepoint <= 0x10FFFF) {
+	VSTRING_ADDCH(buffer, 0xf0 | (codepoint >> 18));
+	VSTRING_ADDCH(buffer, 0x80 | ((codepoint >> 12) & 0x3f));
+	VSTRING_ADDCH(buffer, 0x80 | ((codepoint >> 6) & 0x3f));
+	VSTRING_ADDCH(buffer, 0x80 | (codepoint & 0x3f));
+    } else {
+	msg_panic("%s: out-of-range codepoint U+%X", myname, codepoint);
+    }
+    VSTRING_TERMINATE(buffer);
+}
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <locale.h>
+
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <msg_vstream.h>
+
+int     main(int argc, char **argv)
+{
+    VSTRING *buffer = vstring_alloc(1);
+    VSTRING *dest = vstring_alloc(1);
+    char   *bp;
+    char   *conv_res;
+    char   *cmd;
+    int     codepoint, first, last;
+    VSTREAM *fp;
+
+    if (setlocale(LC_ALL, "C") == 0)
+	msg_fatal("setlocale(LC_ALL, C) failed: %m");
+
+    msg_vstream_init(argv[0], VSTREAM_ERR);
+
+    util_utf8_enable = 1;
+
+    VSTRING_SPACE(buffer, 256);			/* chroot/file pathname */
+
+    while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
+	bp = STR(buffer);
+	vstream_printf("> %s\n", bp);
+	cmd = mystrtok(&bp, CHARS_SPACE);
+	if (cmd == 0 || *cmd == '#')
+	    continue;
+	while (ISSPACE(*bp))
+	    bp++;
+
+	/*
+	 * Null-terminated string.
+	 */
+	if (strcmp(cmd, "fold") == 0) {
+	    conv_res = casefold(dest, bp);
+	    vstream_printf("\"%s\" ->fold \"%s\"\n", bp, conv_res);
+	}
+
+	/*
+	 * Codepoint range.
+	 */
+	else if (strcmp(cmd, "range") == 0
+		 && sscanf(bp, "%i %i", &first, &last) == 2
+		 && first <= last) {
+	    for (codepoint = first; codepoint <= last; codepoint++) {
+		if (codepoint >= 0xD800 && codepoint <= 0xDFFF) {
+		    vstream_printf("skipping surrogate range\n");
+		    codepoint = 0xDFFF;
+		} else {
+		    encode_utf8(buffer, codepoint);
+		    if (msg_verbose)
+			vstream_printf("U+%X -> %s\n", codepoint, STR(buffer));
+		    if (valid_utf8_string(STR(buffer), LEN(buffer)) == 0)
+			msg_fatal("bad utf-8 encoding for U+%X\n", codepoint);
+		    casefold(dest, STR(buffer));
+		}
+	    }
+	    vstream_printf("range completed: 0x%x..0x%x\n", first, last);
+	}
+
+	/*
+	 * Chroot directory.
+	 */
+	else if (strcmp(cmd, "chroot") == 0
+		 && sscanf(bp, "%255s", STR(buffer)) == 1) {
+	    if (geteuid() == 0) {
+		if (chdir(STR(buffer)) < 0)
+		    msg_fatal("chdir(%s): %m", STR(buffer));
+		if (chroot(STR(buffer)) < 0)
+		    msg_fatal("chroot(%s): %m", STR(buffer));
+		vstream_printf("chroot %s completed\n", STR(buffer));
+	    }
+	}
+
+	/*
+	 * File.
+	 */
+	else if (strcmp(cmd, "file") == 0
+		 && sscanf(bp, "%255s", STR(buffer)) == 1) {
+	    if ((fp = vstream_fopen(STR(buffer), O_RDONLY, 0)) == 0)
+		msg_fatal("open(%s): %m", STR(buffer));
+	    while (vstring_fgets_nonl(buffer, fp))
+		vstream_printf("%s\n", casefold(dest, STR(buffer)));
+	    vstream_fclose(fp);
+	}
+
+	/*
+	 * Verbose.
+	 */
+	else if (strcmp(cmd, "verbose") == 0
+		 && sscanf(bp, "%i", &msg_verbose) == 1) {
+	     /* void */ ;
+	}
+
+	/*
+	 * Usage
+	 */
+	else {
+	    vstream_printf("Usage: %s chroot <path> | file <path> | fold <text> | range <first> <last> | verbose <int>\n",
+			   argv[0]);
+	}
+	vstream_fflush(VSTREAM_OUT);
+    }
+    vstring_free(buffer);
+    vstring_free(dest);
+    exit(0);
+}
+
+#endif					/* TEST */