[openssh-commits] [openssh] 05/10: upstream commit
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dtucker pushed a commit to branch master
in repository openssh.
commit 0e059cdf5fd86297546c63fa8607c24059118832
Author: schwarze at openbsd.org <schwarze at openbsd.org>
Date: Wed May 25 23:48:45 2016 +0000
upstream commit
To prevent screwing up terminal settings when printing to
the terminal, for ASCII and UTF-8, escape bytes not forming characters and
bytes forming non-printable characters with vis(3) VIS_OCTAL. For other
character sets, abort printing of the current string in these cases. In
particular, * let scp(1) respect the local user's LC_CTYPE locale(1); *
sanitize data received from the remote host; * sanitize filenames, usernames,
and similar data even locally; * take character display widths into account
for the progressmeter.
This is believed to be sufficient to keep the local terminal safe
on OpenBSD, but bad things can still happen on other systems with
state-dependent locales because many places in the code print
unencoded ASCII characters into the output stream.
Using feedback from djm@ and martijn@,
various aspects discussed with many others.
deraadt@ says it should go in now, i probably already hesitated too long
Upstream-ID: e66afbc94ee396ddcaffd433b9a3b80f387647e0
---
Makefile.in | 2 +-
progressmeter.c | 51 +++++------
scp.c | 45 ++++++----
sftp-client.c | 9 +-
sftp.c | 46 +++++-----
utf8.c | 258 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
utf8.h | 24 ++++++
7 files changed, 369 insertions(+), 66 deletions(-)
diff --git a/Makefile.in b/Makefile.in
index af758d0..6267fef 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -82,7 +82,7 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
compat.o crc32.o deattack.o fatal.o hostfile.o \
log.o match.o md-sha256.o moduli.o nchan.o packet.o opacket.o \
readpass.o rsa.o ttymodes.o xmalloc.o addrmatch.o \
- atomicio.o key.o dispatch.o mac.o uidswap.o uuencode.o misc.o \
+ atomicio.o key.o dispatch.o mac.o uidswap.o uuencode.o misc.o utf.o \
monitor_fdpass.o rijndael.o ssh-dss.o ssh-ecdsa.o ssh-rsa.o dh.o \
msg.o progressmeter.o dns.o entropy.o gss-genr.o umac.o umac128.o \
ssh-pkcs11.o smult_curve25519_ref.o \
diff --git a/progressmeter.c b/progressmeter.c
index 3a45540..4fed2f4 100644
--- a/progressmeter.c
+++ b/progressmeter.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: progressmeter.c,v 1.42 2016/03/02 22:42:40 dtucker Exp $ */
+/* $OpenBSD: progressmeter.c,v 1.43 2016/05/25 23:48:45 schwarze Exp $ */
/*
* Copyright (c) 2003 Nils Nordman. All rights reserved.
*
@@ -31,6 +31,7 @@
#include <errno.h>
#include <signal.h>
+#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
@@ -39,6 +40,7 @@
#include "progressmeter.h"
#include "atomicio.h"
#include "misc.h"
+#include "utf8.h"
#define DEFAULT_WINSIZE 80
#define MAX_WINSIZE 512
@@ -119,14 +121,14 @@ format_size(char *buf, int size, off_t bytes)
void
refresh_progress_meter(void)
{
- char buf[MAX_WINSIZE + 1];
+ char buf[MAX_WINSIZE * 4 + 1];
off_t transferred;
double elapsed, now;
int percent;
off_t bytes_left;
int cur_speed;
int hours, minutes, seconds;
- int i, len;
+ size_t i;
int file_len;
transferred = *counter - (cur_pos ? cur_pos : start_pos);
@@ -157,17 +159,16 @@ refresh_progress_meter(void)
bytes_per_second = cur_speed;
/* filename */
- buf[0] = '\0';
+ buf[0] = '\r';
+ buf[1] = '\0';
file_len = win_size - 35;
if (file_len > 0) {
- len = snprintf(buf, file_len + 1, "\r%s", file);
- if (len < 0)
- len = 0;
- if (len >= file_len + 1)
- len = file_len;
- for (i = len; i < file_len; i++)
- buf[i] = ' ';
- buf[file_len] = '\0';
+ (void) snmprintf(buf + 1, sizeof(buf) - 1 - 35,
+ &file_len, "%s", file);
+ i = strlen(buf);
+ while (++file_len < win_size - 35 && i + 1 < sizeof(buf))
+ buf[i++] = ' ';
+ buf[i] = '\0';
}
/* percent of transfer done */
@@ -175,18 +176,18 @@ refresh_progress_meter(void)
percent = ((float)cur_pos / end_pos) * 100;
else
percent = 100;
- snprintf(buf + strlen(buf), win_size - strlen(buf),
+ snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" %3d%% ", percent);
/* amount transferred */
- format_size(buf + strlen(buf), win_size - strlen(buf),
+ format_size(buf + strlen(buf), sizeof(buf) - strlen(buf),
cur_pos);
- strlcat(buf, " ", win_size);
+ strlcat(buf, " ", sizeof(buf));
/* bandwidth usage */
- format_rate(buf + strlen(buf), win_size - strlen(buf),
+ format_rate(buf + strlen(buf), sizeof(buf) - strlen(buf),
(off_t)bytes_per_second);
- strlcat(buf, "/s ", win_size);
+ strlcat(buf, "/s ", sizeof(buf));
/* ETA */
if (!transferred)
@@ -195,9 +196,9 @@ refresh_progress_meter(void)
stalled = 0;
if (stalled >= STALL_TIME)
- strlcat(buf, "- stalled -", win_size);
+ strlcat(buf, "- stalled -", sizeof(buf));
else if (bytes_per_second == 0 && bytes_left)
- strlcat(buf, " --:-- ETA", win_size);
+ strlcat(buf, " --:-- ETA", sizeof(buf));
else {
if (bytes_left > 0)
seconds = bytes_left / bytes_per_second;
@@ -210,19 +211,21 @@ refresh_progress_meter(void)
seconds -= minutes * 60;
if (hours != 0)
- snprintf(buf + strlen(buf), win_size - strlen(buf),
+ snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
"%d:%02d:%02d", hours, minutes, seconds);
else
- snprintf(buf + strlen(buf), win_size - strlen(buf),
+ snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
" %02d:%02d", minutes, seconds);
if (bytes_left > 0)
- strlcat(buf, " ETA", win_size);
+ strlcat(buf, " ETA", sizeof(buf));
else
- strlcat(buf, " ", win_size);
+ strlcat(buf, " ", sizeof(buf));
}
+ if (win_size < 35)
+ buf[win_size] = '\0';
- atomicio(vwrite, STDOUT_FILENO, buf, win_size - 1);
+ atomicio(vwrite, STDOUT_FILENO, buf, strlen(buf));
last_update = now;
}
diff --git a/scp.c b/scp.c
index 3f0d750..43ca3fa 100644
--- a/scp.c
+++ b/scp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: scp.c,v 1.185 2016/03/02 22:43:52 dtucker Exp $ */
+/* $OpenBSD: scp.c,v 1.186 2016/05/25 23:48:45 schwarze Exp $ */
/*
* scp - secure remote copy. This is basically patched BSD rcp which
* uses ssh to do the data transfer (instead of using rcmd).
@@ -96,6 +96,7 @@
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
+#include <locale.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
@@ -114,6 +115,7 @@
#include "log.h"
#include "misc.h"
#include "progressmeter.h"
+#include "utf8.h"
extern char *__progname;
@@ -191,7 +193,7 @@ do_local_cmd(arglist *a)
if (verbose_mode) {
fprintf(stderr, "Executing:");
for (i = 0; i < a->num; i++)
- fprintf(stderr, " %s", a->list[i]);
+ fmprintf(stderr, " %s", a->list[i]);
fprintf(stderr, "\n");
}
if ((pid = fork()) == -1)
@@ -232,7 +234,7 @@ do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
int pin[2], pout[2], reserved[2];
if (verbose_mode)
- fprintf(stderr,
+ fmprintf(stderr,
"Executing: program %s host %s, user %s, command %s\n",
ssh_program, host,
remuser ? remuser : "(unspecified)", cmd);
@@ -307,7 +309,7 @@ do_cmd2(char *host, char *remuser, char *cmd, int fdin, int fdout)
int status;
if (verbose_mode)
- fprintf(stderr,
+ fmprintf(stderr,
"Executing: 2nd program %s host %s, user %s, command %s\n",
ssh_program, host,
remuser ? remuser : "(unspecified)", cmd);
@@ -378,6 +380,8 @@ main(int argc, char **argv)
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
sanitise_stdfd();
+ setlocale(LC_CTYPE, "");
+
/* Copy argv, because we modify it */
newargv = xcalloc(MAX(argc + 1, 1), sizeof(*newargv));
for (n = 0; n < argc; n++)
@@ -810,9 +814,8 @@ syserr: run_err("%s: %s", name, strerror(errno));
snprintf(buf, sizeof buf, "C%04o %lld %s\n",
(u_int) (stb.st_mode & FILEMODEMASK),
(long long)stb.st_size, last);
- if (verbose_mode) {
- fprintf(stderr, "Sending file modes: %s", buf);
- }
+ if (verbose_mode)
+ fmprintf(stderr, "Sending file modes: %s", buf);
(void) atomicio(vwrite, remout, buf, strlen(buf));
if (response() < 0)
goto next;
@@ -889,7 +892,7 @@ rsource(char *name, struct stat *statp)
(void) snprintf(path, sizeof path, "D%04o %d %.1024s\n",
(u_int) (statp->st_mode & FILEMODEMASK), 0, last);
if (verbose_mode)
- fprintf(stderr, "Entering directory: %s", path);
+ fmprintf(stderr, "Entering directory: %s", path);
(void) atomicio(vwrite, remout, path, strlen(path));
if (response() < 0) {
closedir(dirp);
@@ -929,7 +932,7 @@ sink(int argc, char **argv)
off_t size, statbytes;
unsigned long long ull;
int setimes, targisdir, wrerrno = 0;
- char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
+ char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
struct timeval tv[2];
#define atime tv[0]
@@ -964,12 +967,15 @@ sink(int argc, char **argv)
} while (cp < &buf[sizeof(buf) - 1] && ch != '\n');
*cp = 0;
if (verbose_mode)
- fprintf(stderr, "Sink: %s", buf);
+ fmprintf(stderr, "Sink: %s", buf);
if (buf[0] == '\01' || buf[0] == '\02') {
- if (iamremote == 0)
+ if (iamremote == 0) {
+ (void) snmprintf(visbuf, sizeof(visbuf),
+ NULL, "%s", buf + 1);
(void) atomicio(vwrite, STDERR_FILENO,
- buf + 1, strlen(buf + 1));
+ visbuf, strlen(visbuf));
+ }
if (buf[0] == '\02')
exit(1);
++errs;
@@ -1212,7 +1218,7 @@ screwup:
int
response(void)
{
- char ch, *cp, resp, rbuf[2048];
+ char ch, *cp, resp, rbuf[2048], visbuf[2048];
if (atomicio(read, remin, &resp, sizeof(resp)) != sizeof(resp))
lostconn(0);
@@ -1232,8 +1238,13 @@ response(void)
*cp++ = ch;
} while (cp < &rbuf[sizeof(rbuf) - 1] && ch != '\n');
- if (!iamremote)
- (void) atomicio(vwrite, STDERR_FILENO, rbuf, cp - rbuf);
+ if (!iamremote) {
+ cp[-1] = '\0';
+ (void) snmprintf(visbuf, sizeof(visbuf),
+ NULL, "%s\n", rbuf);
+ (void) atomicio(vwrite, STDERR_FILENO,
+ visbuf, strlen(visbuf));
+ }
++errs;
if (resp == 1)
return (-1);
@@ -1271,7 +1282,7 @@ run_err(const char *fmt,...)
if (!iamremote) {
va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
+ vfmprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
@@ -1317,7 +1328,7 @@ okname(char *cp0)
} while (*++cp);
return (1);
-bad: fprintf(stderr, "%s: invalid user name\n", cp0);
+bad: fmprintf(stderr, "%s: invalid user name\n", cp0);
return (0);
}
diff --git a/sftp-client.c b/sftp-client.c
index faf1468..0ca44a4 100644
--- a/sftp-client.c
+++ b/sftp-client.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp-client.c,v 1.123 2016/05/02 08:49:03 djm Exp $ */
+/* $OpenBSD: sftp-client.c,v 1.124 2016/05/25 23:48:45 schwarze Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm at openbsd.org>
*
@@ -53,6 +53,7 @@
#include "atomicio.h"
#include "progressmeter.h"
#include "misc.h"
+#include "utf8.h"
#include "sftp.h"
#include "sftp-common.h"
@@ -610,7 +611,7 @@ do_lsreaddir(struct sftp_conn *conn, const char *path, int print_flag,
}
if (print_flag)
- printf("%s\n", longname);
+ mprintf("%s\n", longname);
/*
* Directory entries should never contain '/'
@@ -1460,7 +1461,7 @@ download_dir_internal(struct sftp_conn *conn, const char *src, const char *dst,
return -1;
}
if (print_flag)
- printf("Retrieving %s\n", src);
+ mprintf("Retrieving %s\n", src);
if (dirattrib->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
mode = dirattrib->perm & 01777;
@@ -1793,7 +1794,7 @@ upload_dir_internal(struct sftp_conn *conn, const char *src, const char *dst,
return -1;
}
if (print_flag)
- printf("Entering %s\n", src);
+ mprintf("Entering %s\n", src);
attrib_clear(&a);
stat_to_attrib(&sb, &a);
diff --git a/sftp.c b/sftp.c
index 3d2d13a..6a70484 100644
--- a/sftp.c
+++ b/sftp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp.c,v 1.173 2016/04/08 08:19:17 djm Exp $ */
+/* $OpenBSD: sftp.c,v 1.174 2016/05/25 23:48:45 schwarze Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm at openbsd.org>
*
@@ -49,6 +49,7 @@ typedef void EditLine;
#endif
#include <limits.h>
#include <signal.h>
+#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
@@ -63,6 +64,7 @@ typedef void EditLine;
#include "log.h"
#include "pathnames.h"
#include "misc.h"
+#include "utf8.h"
#include "sftp.h"
#include "ssherr.h"
@@ -644,9 +646,11 @@ process_get(struct sftp_conn *conn, char *src, char *dst, char *pwd,
resume |= global_aflag;
if (!quiet && resume)
- printf("Resuming %s to %s\n", g.gl_pathv[i], abs_dst);
+ mprintf("Resuming %s to %s\n",
+ g.gl_pathv[i], abs_dst);
else if (!quiet && !resume)
- printf("Fetching %s to %s\n", g.gl_pathv[i], abs_dst);
+ mprintf("Fetching %s to %s\n",
+ g.gl_pathv[i], abs_dst);
if (pathname_is_dir(g.gl_pathv[i]) && (rflag || global_rflag)) {
if (download_dir(conn, g.gl_pathv[i], abs_dst, NULL,
pflag || global_pflag, 1, resume,
@@ -735,10 +739,11 @@ process_put(struct sftp_conn *conn, char *src, char *dst, char *pwd,
resume |= global_aflag;
if (!quiet && resume)
- printf("Resuming upload of %s to %s\n", g.gl_pathv[i],
- abs_dst);
+ mprintf("Resuming upload of %s to %s\n",
+ g.gl_pathv[i], abs_dst);
else if (!quiet && !resume)
- printf("Uploading %s to %s\n", g.gl_pathv[i], abs_dst);
+ mprintf("Uploading %s to %s\n",
+ g.gl_pathv[i], abs_dst);
if (pathname_is_dir(g.gl_pathv[i]) && (rflag || global_rflag)) {
if (upload_dir(conn, g.gl_pathv[i], abs_dst,
pflag || global_pflag, 1, resume,
@@ -839,12 +844,12 @@ do_ls_dir(struct sftp_conn *conn, char *path, char *strip_path, int lflag)
attrib_to_stat(&d[n]->a, &sb);
lname = ls_file(fname, &sb, 1,
(lflag & LS_SI_UNITS));
- printf("%s\n", lname);
+ mprintf("%s\n", lname);
free(lname);
} else
- printf("%s\n", d[n]->longname);
+ mprintf("%s\n", d[n]->longname);
} else {
- printf("%-*s", colspace, fname);
+ mprintf("%-*s", colspace, fname);
if (c >= columns) {
printf("\n");
c = 1;
@@ -925,10 +930,10 @@ do_globbed_ls(struct sftp_conn *conn, char *path, char *strip_path,
}
lname = ls_file(fname, g.gl_statv[i], 1,
(lflag & LS_SI_UNITS));
- printf("%s\n", lname);
+ mprintf("%s\n", lname);
free(lname);
} else {
- printf("%-*s", colspace, fname);
+ mprintf("%-*s", colspace, fname);
if (c >= columns) {
printf("\n");
c = 1;
@@ -1456,7 +1461,7 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
if (!quiet)
- printf("Removing %s\n", g.gl_pathv[i]);
+ mprintf("Removing %s\n", g.gl_pathv[i]);
err = do_rm(conn, g.gl_pathv[i]);
if (err != 0 && err_abort)
break;
@@ -1556,7 +1561,8 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
remote_glob(conn, path1, GLOB_NOCHECK, NULL, &g);
for (i = 0; g.gl_pathv[i] && !interrupted; i++) {
if (!quiet)
- printf("Changing mode on %s\n", g.gl_pathv[i]);
+ mprintf("Changing mode on %s\n",
+ g.gl_pathv[i]);
err = do_setstat(conn, g.gl_pathv[i], &a);
if (err != 0 && err_abort)
break;
@@ -1586,12 +1592,12 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
aa->flags &= SSH2_FILEXFER_ATTR_UIDGID;
if (cmdnum == I_CHOWN) {
if (!quiet)
- printf("Changing owner on %s\n",
+ mprintf("Changing owner on %s\n",
g.gl_pathv[i]);
aa->uid = n_arg;
} else {
if (!quiet)
- printf("Changing group on %s\n",
+ mprintf("Changing group on %s\n",
g.gl_pathv[i]);
aa->gid = n_arg;
}
@@ -1601,7 +1607,7 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
}
break;
case I_PWD:
- printf("Remote working directory: %s\n", *pwd);
+ mprintf("Remote working directory: %s\n", *pwd);
break;
case I_LPWD:
if (!getcwd(path_buf, sizeof(path_buf))) {
@@ -1609,7 +1615,7 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
err = -1;
break;
}
- printf("Local working directory: %s\n", path_buf);
+ mprintf("Local working directory: %s\n", path_buf);
break;
case I_QUIT:
/* Processed below */
@@ -1678,7 +1684,7 @@ complete_display(char **list, u_int len)
for (y = 0; list[y]; y++) {
llen = strlen(list[y]);
tmp = llen > len ? list[y] + len : "";
- printf("%-*s", colspace, tmp);
+ mprintf("%-*s", colspace, tmp);
if (m >= columns) {
printf("\n");
m = 1;
@@ -2062,7 +2068,7 @@ interactive_loop(struct sftp_conn *conn, char *file1, char *file2)
if (remote_is_dir(conn, dir) && file2 == NULL) {
if (!quiet)
- printf("Changing to: %s\n", dir);
+ mprintf("Changing to: %s\n", dir);
snprintf(cmd, sizeof cmd, "cd \"%s\"", dir);
if (parse_dispatch_command(conn, cmd,
&remote_path, 1) != 0) {
@@ -2106,7 +2112,7 @@ interactive_loop(struct sftp_conn *conn, char *file1, char *file2)
break;
}
if (!interactive) { /* Echo command */
- printf("sftp> %s", cmd);
+ mprintf("sftp> %s", cmd);
if (strlen(cmd) > 0 &&
cmd[strlen(cmd) - 1] != '\n')
printf("\n");
diff --git a/utf8.c b/utf8.c
new file mode 100644
index 0000000..d6089bd
--- /dev/null
+++ b/utf8.c
@@ -0,0 +1,258 @@
+/* $OpenBSD: utf8.c,v 1.1 2016/05/25 23:48:45 schwarze Exp $ */
+/*
+ * Copyright (c) 2016 Ingo Schwarze <schwarze at openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Utility functions for multibyte-character handling,
+ * in particular to sanitize untrusted strings for terminal output.
+ */
+
+#include <sys/types.h>
+#include <langinfo.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <vis.h>
+#include <wchar.h>
+
+#include "utf8.h"
+
+static int dangerous_locale(void);
+static int vasnmprintf(char **, size_t, int *, const char *, va_list);
+
+
+/*
+ * For US-ASCII and UTF-8 encodings, we can safely recover from
+ * encoding errors and from non-printable characters. For any
+ * other encodings, err to the side of caution and abort parsing:
+ * For state-dependent encodings, recovery is impossible.
+ * For arbitrary encodings, replacement of non-printable
+ * characters would be non-trivial and too fragile.
+ */
+
+static int
+dangerous_locale(void) {
+ char *loc;
+
+ loc = nl_langinfo(CODESET);
+ return strcmp(loc, "US-ASCII") && strcmp(loc, "UTF-8");
+}
+
+/*
+ * The following two functions limit the number of bytes written,
+ * including the terminating '\0', to sz. Unless wp is NULL,
+ * they limit the number of display columns occupied to *wp.
+ * Whichever is reached first terminates the output string.
+ * To stay close to the standard interfaces, they return the number of
+ * non-NUL bytes that would have been written if both were unlimited.
+ * If wp is NULL, newline, carriage return, and tab are allowed;
+ * otherwise, the actual number of columns occupied by what was
+ * written is returned in *wp.
+ */
+
+static int
+vasnmprintf(char **str, size_t maxsz, int *wp, const char *fmt, va_list ap)
+{
+ char *src; /* Source string returned from vasprintf. */
+ char *sp; /* Pointer into src. */
+ char *dst; /* Destination string to be returned. */
+ char *dp; /* Pointer into dst. */
+ char *tp; /* Temporary pointer for dst. */
+ size_t sz; /* Number of bytes allocated for dst. */
+ size_t tsz; /* Temporary size while extending dst. */
+ wchar_t wc; /* Wide character at sp. */
+ int len; /* Number of bytes in the character at sp. */
+ int ret; /* Number of bytes needed to format src. */
+ int width; /* Display width of the character wc. */
+ int total_width, max_width, print;
+
+ src = dst = NULL;
+ if (vasprintf(&src, fmt, ap) <= 0)
+ goto fail;
+
+ sz = strlen(src);
+ if ((dst = malloc(sz)) == NULL)
+ goto fail;
+
+ if (maxsz > INT_MAX)
+ maxsz = INT_MAX;
+
+ sp = src;
+ dp = dst;
+ ret = 0;
+ print = 1;
+ total_width = 0;
+ max_width = wp == NULL ? INT_MAX : *wp;
+ while (*sp != '\0') {
+ if ((len = mbtowc(&wc, sp, MB_CUR_MAX)) == -1) {
+ (void)mbtowc(NULL, NULL, MB_CUR_MAX);
+ if (dangerous_locale()) {
+ ret = -1;
+ break;
+ }
+ len = 1;
+ width = -1;
+ } else if (wp == NULL &&
+ (wc == L'\n' || wc == L'\r' || wc == L'\t')) {
+ /*
+ * Don't use width uninitialized; the actual
+ * value doesn't matter because total_width
+ * is only returned for wp != NULL.
+ */
+ width = 0;
+ } else if ((width = wcwidth(wc)) == -1 &&
+ dangerous_locale()) {
+ ret = -1;
+ break;
+ }
+
+ /* Valid, printable character. */
+
+ if (width >= 0) {
+ if (print && (dp - dst >= (int)maxsz - len ||
+ total_width > max_width - width))
+ print = 0;
+ if (print) {
+ total_width += width;
+ memcpy(dp, sp, len);
+ dp += len;
+ }
+ sp += len;
+ if (ret >= 0)
+ ret += len;
+ continue;
+ }
+
+ /* Escaping required. */
+
+ while (len > 0) {
+ if (print && (dp - dst >= (int)maxsz - 4 ||
+ total_width > max_width - 4))
+ print = 0;
+ if (print) {
+ if (dp + 4 >= dst + sz) {
+ tsz = sz + 128;
+ if (tsz > maxsz)
+ tsz = maxsz;
+ tp = realloc(dst, tsz);
+ if (tp == NULL) {
+ ret = -1;
+ break;
+ }
+ dp = tp + (dp - dst);
+ dst = tp;
+ sz = tsz;
+ }
+ tp = vis(dp, *sp, VIS_OCTAL | VIS_ALL, 0);
+ width = tp - dp;
+ total_width += width;
+ dp = tp;
+ } else
+ width = 4;
+ len--;
+ sp++;
+ if (ret >= 0)
+ ret += width;
+ }
+ if (len > 0)
+ break;
+ }
+ free(src);
+ *dp = '\0';
+ *str = dst;
+ if (wp != NULL)
+ *wp = total_width;
+
+ /*
+ * If the string was truncated by the width limit but
+ * would have fit into the size limit, the only sane way
+ * to report the problem is using the return value, such
+ * that the usual idiom "if (ret < 0 || ret >= sz) error"
+ * works as expected.
+ */
+
+ if (ret < (int)maxsz && !print)
+ ret = -1;
+ return ret;
+
+fail:
+ free(src);
+ free(dst);
+ *str = NULL;
+ if (wp != NULL)
+ *wp = 0;
+ return -1;
+}
+
+int
+snmprintf(char *str, size_t sz, int *wp, const char *fmt, ...)
+{
+ va_list ap;
+ char *cp;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = vasnmprintf(&cp, sz, wp, fmt, ap);
+ va_end(ap);
+ (void)strlcpy(str, cp, sz);
+ free(cp);
+ return ret;
+}
+
+/*
+ * To stay close to the standard interfaces, the following functions
+ * return the number of non-NUL bytes written.
+ */
+
+int
+vfmprintf(FILE *stream, const char *fmt, va_list ap)
+{
+ char *str;
+ int ret;
+
+ if ((ret = vasnmprintf(&str, INT_MAX, NULL, fmt, ap)) < 0)
+ return -1;
+ if (fputs(str, stream) == EOF)
+ ret = -1;
+ free(str);
+ return ret;
+}
+
+int
+fmprintf(FILE *stream, const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = vfmprintf(stream, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+
+int
+mprintf(const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = vfmprintf(stdout, fmt, ap);
+ va_end(ap);
+ return ret;
+}
diff --git a/utf8.h b/utf8.h
new file mode 100644
index 0000000..43ce1d5
--- /dev/null
+++ b/utf8.h
@@ -0,0 +1,24 @@
+/* $OpenBSD: utf8.h,v 1.1 2016/05/25 23:48:45 schwarze Exp $ */
+/*
+ * Copyright (c) 2016 Ingo Schwarze <schwarze at openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+int mprintf(const char *, ...)
+ __attribute__((format(printf, 1, 2)));
+int fmprintf(FILE *, const char *, ...)
+ __attribute__((format(printf, 2, 3)));
+int vfmprintf(FILE *, const char *, va_list);
+int snmprintf(char *, size_t, int *, const char *, ...)
+ __attribute__((format(printf, 4, 5)));
--
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