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util.c
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/* util.c -- general utility functions
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, 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.
*
* $Id: util.c,v 1.40 2010/06/28 12:06:43 brong Exp $
*/
#include <config.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/socket.h>
#include <errno.h>
#include "exitcodes.h"
#include "util.h"
#include "xmalloc.h"
#define BEAUTYBUFSIZE 4096
const unsigned char unxdigit[128] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
const unsigned char convert_to_lowercase[256] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
};
const unsigned char convert_to_uppercase[256] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 'A', 'B', 'C', 'D', 'E', 'F', 'G',
'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
};
/* convert string to all lower case
*/
char *lcase(char* str)
{
char *scan = str;
while (*scan) {
*scan = TOLOWER(*scan);
scan++;
}
return (str);
}
/* convert string to all upper case
*/
char *ucase(char* str)
{
char *scan = str;
while (*scan) {
*scan = convert_to_uppercase[(unsigned char)(*scan)];
scan++;
}
return (str);
}
/* clean up control characters in a string while copying it
* returns pointer to end of dst string.
* dst must have twice the length of source
*/
char *beautify_copy(char* dst, const char* src)
{
unsigned char c;
while (*src) {
c = *src++ & 0x7F;
if (!isprint(c)) {
*dst++ = '^';
if (c > ' ') {
c = '?';
} else {
c += '@';
}
}
*dst++ = c;
}
*dst = '\0';
return (dst);
}
/* clean up control characters in a string while copying it
* returns pointer to a static buffer containing the cleaned-up version
*/
char *beautify_string(const char* src)
{
static char *beautybuf = NULL;
static int beautysize = 0;
int len;
len = strlen(src) * 2 + 1;
if (beautysize < len) {
if (!beautysize) {
beautysize = len > BEAUTYBUFSIZE ? len : BEAUTYBUFSIZE;
beautybuf = xmalloc(beautysize);
} else {
beautysize *= 2;
if (len > beautysize) beautysize = len;
beautybuf = xrealloc(beautybuf, beautysize);
}
}
(void) beautify_copy(beautybuf, src);
return beautybuf;
}
/* do a binary search in a keyvalue array
* nelem is the number of keyvalue elements in the kv array
* cmpf is the comparison function (strcmp, strcasecmp, etc).
* returns NULL if not found, or key/value pair if found.
*/
keyvalue *kv_bsearch(const char* key, keyvalue* kv, int nelem,
int (*cmpf) (const char *s1, const char *s2))
{
int top, mid = 0, bot, cmp = 0;
cmp = 1;
bot = 0;
top = nelem - 1;
while (top >= bot && (cmp = (*cmpf)(key, kv[mid = (bot + top) >> 1].key)))
if (cmp < 0) {
top = mid - 1;
} else {
bot = mid + 1;
}
return (cmp ? NULL : kv + mid);
}
/* Examine the name of a file, and return a single character
* (as an int) that can be used as the name of a hash
* directory. Stop before the first dot. Caller is responsible
* for skipping any prefix of the name.
*/
int dir_hash_c(const char *name, int full)
{
int c;
if (full) {
unsigned char *pt;
unsigned int n;
enum {
DIR_X = 3,
DIR_Y = 5,
DIR_P = 23,
DIR_A = 'A'
};
n = 0;
pt = (unsigned char *)name;
while (*pt && *pt != '.') {
n = ((n << DIR_X) ^ (n >> DIR_Y)) ^ *pt;
++pt;
}
c = DIR_A + (n % DIR_P);
}
else {
c = tolower(*name);
if (!Uisascii(c) || !Uislower(c)) c = 'q';
}
return c;
}
int cyrus_close_sock(int fd)
{
shutdown(fd, SHUT_RD);
return close(fd);
}
void cyrus_reset_stdio(void)
{
int devnull = open("/dev/null", O_RDWR, 0);
if (devnull == -1) {
fatal("open() on /dev/null failed", EC_TEMPFAIL);
}
/* stdin */
shutdown(0, SHUT_RD);
dup2(devnull, 0);
/* stdout */
shutdown(1, SHUT_RD);
dup2(devnull, 1);
/* stderr */
shutdown(2, SHUT_RD);
dup2(devnull, 2);
if (devnull > 2) close(devnull);
}
/* Given a directory, create a unique temporary file open for
* reading and writing and return the file descriptor.
*
* This routine also unlinks the file so it won't appear in the
* directory listing (but you won't have to worry about cleaning up
* after it)
*/
int create_tempfile(const char *path)
{
int fd;
char *pattern;
pattern = strconcat(path, "/cyrus_tmpfile_XXXXXX", (char *)NULL);
fd = mkstemp(pattern);
if (fd >= 0 && unlink(pattern) == -1) {
close(fd);
fd = -1;
}
free(pattern);
return fd;
}
/* Create all parent directories for the given path,
* up to but not including the basename.
*/
int cyrus_mkdir(const char *path, mode_t mode __attribute__((unused)))
{
char *p = (char *) path;
int save_errno;
struct stat sbuf;
while ((p = strchr(p+1, '/'))) {
*p = '\0';
if (mkdir(path, 0755) == -1 && errno != EEXIST) {
save_errno = errno;
if (stat(path, &sbuf) == -1) {
errno = save_errno;
syslog(LOG_ERR, "IOERROR: creating directory %s: %m", path);
return -1;
}
}
*p = '/';
}
return 0;
}
int become_cyrus(void)
{
struct passwd *p;
int newuid, newgid;
int result;
static int uid = 0;
if (uid) return setuid(uid);
p = getpwnam(CYRUS_USER);
if (p == NULL) {
syslog(LOG_ERR, "no entry in /etc/passwd for user %s", CYRUS_USER);
return -1;
}
/* Save these in case initgroups does a getpw*() */
newuid = p->pw_uid;
newgid = p->pw_gid;
if (initgroups(CYRUS_USER, newgid)) {
syslog(LOG_ERR, "unable to initialize groups for user %s: %s",
CYRUS_USER, strerror(errno));
return -1;
}
if (setgid(newgid)) {
syslog(LOG_ERR, "unable to set group id to %d for user %s: %s",
newgid, CYRUS_USER, strerror(errno));
return -1;
}
result = setuid(newuid);
/* Only set static uid if successful, else future calls won't reset gid */
if (result == 0)
uid = newuid;
return result;
}
static int cmdtime_enabled = 0;
static struct timeval cmdtime_start, cmdtime_end, nettime_start, nettime_end;
static double totaltime, cmdtime, nettime;
static double timesub(const struct timeval *start, const struct timeval *end)
{
return (double)(end->tv_sec - start->tv_sec) +
(double)(end->tv_usec - start->tv_usec)/1000000.0;
}
void cmdtime_settimer(int enable)
{
cmdtime_enabled = enable;
}
void cmdtime_starttimer(void)
{
if (!cmdtime_enabled)
return;
gettimeofday(&cmdtime_start, 0);
totaltime = cmdtime = nettime = 0.0;
}
void cmdtime_endtimer(double *pcmdtime, double *pnettime)
{
if (!cmdtime_enabled)
return;
gettimeofday(&cmdtime_end, 0);
totaltime = timesub(&cmdtime_start, &cmdtime_end);
cmdtime = totaltime - nettime;
*pcmdtime = cmdtime;
*pnettime = nettime;
}
void cmdtime_netstart(void)
{
if (!cmdtime_enabled)
return;
gettimeofday(&nettime_start, 0);
}
void cmdtime_netend(void)
{
if (!cmdtime_enabled)
return;
gettimeofday(&nettime_end, 0);
nettime += timesub(&nettime_start, &nettime_end);
}
int parseint32(const char *p, const char **ptr, int32_t *res)
{
int32_t result = 0;
int gotchar = 0;
if (!p) return -1;
/* INT_MAX == 2147483647 */
while (cyrus_isdigit(*p)) {
if (result > 214748364 || (result == 214748364 && (*p > '7')))
fatal("num too big", EC_IOERR);
result = result * 10 + *p++ - '0';
gotchar = 1;
}
if (!gotchar) return -1;
if (ptr) *ptr = p;
if (res) *res = result;
return 0;
}
int parseuint32(const char *p, const char **ptr, uint32_t *res)
{
uint32_t result = 0;
int gotchar = 0;
if (!p) return -1;
/* UINT_MAX == 4294967295U */
while (cyrus_isdigit(*p)) {
if (result > 429496729 || (result == 429496729 && (*p > '5')))
fatal("num too big", EC_IOERR);
result = result * 10 + *p++ - '0';
gotchar = 1;
}
if (!gotchar) return -1;
if (ptr) *ptr = p;
if (res) *res = result;
return 0;
}
int parsenum(const char *p, const char **ptr, int maxlen, bit64 *res)
{
bit64 result = 0;
int n;
int cval;
/* ULLONG_MAX == 18446744073709551615ULL
* - and I don't care about those last 5
*/
for (n = 0; !maxlen || n < maxlen; n++) {
if (result > 1844674407370955161ULL)
fatal("num too big", EC_IOERR);
if (!cyrus_isdigit(p[n]))
break;
cval = p[n] - '0';
result = result * 10 + (p[n] - '0');
}
/* no characters found... */
if (!n) return -1;
if (ptr) *ptr = p + n;
if (res) *res = result;
return 0;
}
int parsehex(const char *p, const char **ptr, int maxlen, bit64 *res)
{
bit64 result = 0;
int n;
int cval;
/* ULLONG_MAX == 18446744073709551615ULL
* - and I don't care about those last 5
*/
for (n = 0; !maxlen || n < maxlen; n++) {
if (result > 1844674407370955161ULL)
fatal("num too big", EC_IOERR);
cval = unxdigit[p[n]];
if (cval == 0xff) break;
result = result * 10 + (p[n] - '0');
}
/* no characters found... */
if (!n) return -1;
if (ptr) *ptr = p + n;
if (res) *res = result;
return 0;
}
/* buffer handling functions */
#define BUF_GROW 1024
void buf_ensure(struct buf *buf, int n)
{
int newlen = (buf->len + n + BUF_GROW); /* XXX - size mod logic? */
if (buf->alloc >= (buf->len + n))
return;
if (buf->alloc) {
buf->s = xrealloc(buf->s, newlen);
}
else {
char *s = xmalloc(newlen);
if (buf->len) /* copy on write */
memcpy(s, buf->s, buf->len);
buf->s = s;
}
buf->alloc = newlen;
}
const char *buf_cstring(struct buf *buf)
{
if (!(buf->flags & BUF_CSTRING)) {
buf_ensure(buf, 1);
buf->s[buf->len] = '\0';
buf->flags |= BUF_CSTRING;
}
return buf->s;
}
char *buf_release(struct buf *buf)
{
char *ret;
/* make sure it's NULL terminated - also guarantees it's a
* malloc'ed string */
buf_ensure(buf, 1);
ret = buf->s;
ret[buf->len] = '\0';
/* zero out the buffer so it no longer manages the string */
buf->s = NULL;
buf->len = 0;
buf->alloc = 0;
buf->flags = 0;
return ret;
}
void buf_getmap(struct buf *buf, const char **base, int *len)
{
*base = buf->s;
*len = buf->len;
}
unsigned buf_len(struct buf *buf)
{
return buf->len;
}
void buf_reset(struct buf *buf)
{
buf->len = 0;
buf->flags &= ~BUF_CSTRING;
}
void buf_truncate(struct buf *buf, unsigned int len)
{
if (len > buf->alloc) {
/* grow the buffer and zero-fill the new bytes */
unsigned int more = len - buf->len;
buf_ensure(buf, more);
memset(buf->s + buf->len, 0, more);
}
buf->len = len;
buf->flags &= ~BUF_CSTRING;
}
void buf_setcstr(struct buf *buf, const char *str)
{
buf_setmap(buf, str, strlen(str));
}
void buf_setmap(struct buf *buf, const char *base, int len)
{
buf_reset(buf);
if (len) {
buf_ensure(buf, len);
memcpy(buf->s, base, len);
buf->len = len;
}
}
void buf_copy(struct buf *dst, const struct buf *src)
{
buf_setmap(dst, src->s, src->len);
}
void buf_append(struct buf *dst, const struct buf *src)
{
buf_appendmap(dst, src->s, src->len);
}
void buf_appendcstr(struct buf *buf, const char *str)
{
buf_appendmap(buf, str, strlen(str));
}
void buf_appendbit32(struct buf *buf, bit32 num)
{
bit32 item = htonl(num);
buf_appendmap(buf, (char *)&item, 4);
}
void buf_appendmap(struct buf *buf, const char *base, int len)
{
if (len) {
buf_ensure(buf, len);
memcpy(buf->s + buf->len, base, len);
buf->len += len;
buf->flags &= ~BUF_CSTRING;
}
}
void buf_putc(struct buf *buf, char c)
{
buf_ensure(buf, 1);
buf->s[buf->len++] = c;
buf->flags &= ~BUF_CSTRING;
}
void buf_printf(struct buf *buf, const char *fmt, ...)
{
va_list args;
int room;
int n;
/* Add some more room to the buffer. We just guess a
* size and rely on vsnprintf() to tell us if it
* needs to overrun the size. */
buf_ensure(buf, 1024);
room = buf->alloc - buf->len - 1;
va_start(args, fmt);
n = vsnprintf(buf->s + buf->len, room+1, fmt, args);
va_end(args);
if (n > room) {
/* woops, we guessed wrong...retry */
buf_ensure(buf, n-room);
va_start(args, fmt);
n = vsnprintf(buf->s + buf->len, n+1, fmt, args);
va_end(args);
}
buf->len += n;
/* vsnprintf() gave us a trailing NUL, so we may as well remember
* that for later */
buf->flags |= BUF_CSTRING;
}
/**
* Replace all instances of the string literal @match in @buf
* with the string @replace, which may be NULL to just remove
* instances of @match.
* Returns: the number of substitutions made.
*/
unsigned int buf_replace_all(struct buf *buf, const char *match,
const char *replace)
{
unsigned int n = 0;
int matchlen = strlen(match);
int replacelen = (replace ? strlen(replace) : 0);
char *p;
/* we need buf to be a nul terminated string now please */
buf_cstring(buf);
p = buf->s;
while ((p = strstr(p, match))) {
if (replacelen > matchlen) {
/* string will need to expand */
int dp = (p - buf->s);
buf_ensure(buf, replacelen - matchlen);
p = buf->s + dp;
}
if (matchlen != replacelen) {
memmove(p+replacelen, p+matchlen,
buf->len - (p - buf->s) - matchlen + replacelen + 1);
buf->len += (replacelen - matchlen);
}
if (replace)
memcpy(p, replace, replacelen);
n++;
p += replacelen;
}
return n;
}
void buf_init(struct buf *buf)
{
buf->alloc = 0;
buf->len = 0;
buf->flags = 0;
buf->s = NULL;
}
void buf_free(struct buf *buf)
{
if (buf->alloc)
free(buf->s);
buf->alloc = 0;
buf->s = NULL;
buf->len = 0;
buf->flags = 0;
}
char *strconcat(const char *s1, ...)
{
int sz = 1; /* 1 byte for the trailing NUL */
const char *s;
char *buf;
char *p;
va_list args;
if (s1 == NULL)
return NULL;
/* first pass: calculate length */
sz += strlen(s1);
va_start(args, s1);
while ((s = va_arg(args, const char *)) != NULL)
sz += strlen(s);
va_end(args);
/* allocate exactly the right amount of space */
p = buf = xmalloc(sz);
/* second pass: copy strings in */
strcpy(p, s1);
p += strlen(p);
va_start(args, s1);
while ((s = va_arg(args, const char *)) != NULL) {
strcpy(p, s);
p += strlen(p);
}
va_end(args);
return buf;
}
int bin_to_hex(const void *bin, size_t binlen, char *hex, int flags)
{
const unsigned char *v = bin;
char *p = hex;
size_t i;
const char *xd = (flags & BH_UPPER ? "0123456789ABCDEF" : "0123456789abcdef");
char sep = _BH_GETSEP(flags);
for (i = 0; i < binlen; i++, v++) {
if (i && sep)
*p++ = sep;
*p++ = xd[(*v >> 4) & 0xf];
*p++ = xd[*v & 0xf];
}
*p = '\0';
return p-hex;
}
int hex_to_bin(const char *hex, size_t hexlen, void *bin)
{
unsigned char *v = bin, msn, lsn;
const char *p = hex;
size_t i;
if (hex == NULL)
return -1;
if (hexlen == 0)
hexlen = strlen(hex);
if (hexlen % 2)
return -1;
hexlen /= 2;
for (i = 0 ; i < hexlen ; i++) {
msn = unxdigit[(*p++) & 0x7f];
if (msn == 0xff)
return -1;
lsn = unxdigit[(*p++) & 0x7f];
if (lsn == 0xff)
return -1;
*v++ = (msn << 4) | lsn;
}
return (unsigned char *)v - (unsigned char *)bin;
}

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