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/* source: utils.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* useful additions to C library */
#include "config.h"
#include "sysincludes.h"
#include "compat.h" /* socklen_t */
#include "mytypes.h"
#include "sycls.h"
#include "utils.h"
#if !HAVE_PROTOTYPE_LIB_memrchr
/* GNU extension, available since glibc 2.1.91 */
void *memrchr(const void *s, int c, size_t n) {
const unsigned char *t = ((unsigned char *)s)+n;
while (--t >= (unsigned char *)s) {
if (*t == c) break;
}
if (t < (unsigned char *)s)
return NULL;
return (void *)t;
}
#endif /* !HAVE_PROTOTYPE_LIB_memrchr */
void *memdup(const void *src, size_t n) {
void *dest;
if ((dest = Malloc(n)) == NULL) {
return NULL;
}
memcpy(dest, src, n);
return dest;
}
#if !HAVE_PROTOTYPE_LIB_strndup
char *strndup(
const char *s,
size_t n)
{
char *m;
m = malloc(n+1);
if (m == NULL) {
return m;
}
strncpy(m, s, n);
m[n] = '\0';
return m;
}
#endif /* !HAVE_PROTOTYPE_LIB_strndup */
/* search the keyword-table for a match of the leading part of name. */
/* returns the pointer to the matching field of the keyword or NULL if no
keyword was found. */
const struct wordent *keyw(const struct wordent *keywds, const char *name, unsigned int nkeys) {
unsigned int lower, upper, mid;
int r;
lower = 0;
upper = nkeys;
while (upper - lower > 1)
{
mid = (upper + lower) >> 1;
if (!(r = strcasecmp(keywds[mid].name, name)))
{
return &keywds[mid];
}
if (r < 0)
lower = mid;
else
upper = mid;
}
if (nkeys > 0 && !(strcasecmp(keywds[lower].name, name)))
{
return &keywds[lower];
}
return NULL;
}
/* Linux: setenv(), AIX (4.3?): putenv() */
#if !HAVE_SETENV
int setenv(const char *name, const char *value, int overwrite) {
int result;
char *env;
if (!overwrite) {
if (getenv(name)) return 0; /* already exists */
}
if ((env = Malloc(strlen(name)+strlen(value)+2)) == NULL) {
return -1;
}
sprintf(env, "%s=%s", name, value);
if ((result = putenv(env)) != 0) { /* AIX docu says "... nonzero ..." */
free(env);
result = -1;
}
/* linux "man putenv" says: ...this string becomes part of the environment*/
return result;
}
#endif /* !HAVE_SETENV */
/* sanitizes an "untrusted" character. output buffer must provide at least 4
characters space.
Does not append \0. returns length of output (currently: max 4) */
static size_t sanitize_char(char c, char *o, int style) {
int hn; /* high nibble */
int ln; /* low nibble */
int n; /* written chars */
if (isprint((unsigned char)c)) {
*o = c;
return 1;
}
*o++ = '\\';
n = 2;
switch (c) {
case '\0': *o++ = '0'; break;
case '\a': *o++ = 'a'; break;
case '\b': *o++ = 'b'; break;
case '\t': *o++ = 't'; break;
case '\n': *o++ = 'n'; break;
case '\v': *o++ = 'v'; break;
case '\f': *o++ = 'f'; break;
case '\r': *o++ = 'r'; break;
case '\'': *o++ = '\''; break;
case '\"': *o++ = '"'; break;
case '\\': *o++ = '\\'; break;
default:
*o++ = 'x';
hn = (c>>4)&0x0f;
ln = c&0x0f;
*o++ = (hn>=10 ? (('A'-1)+(hn-10)) : ('0'+hn));
*o++ = (ln>=10 ? (('A'-1)+(ln-10)) : ('0'+ln));
n = 4;
}
return n;
}
/* sanitizes "untrusted" text, replacing special control characters with the C
string version (eg."\n"), and replacing unprintable chars with hex
representation ("\xAB").
text can grow to four times of input, so keep output buffer long enough!
returns a pointer to the first untouched byte of the output buffer.
Output is not \0 terminated.
*/
char *sanitize_string(const char *data, /* input data */
size_t bytes, /* length of input data, >=0 */
char *coded, /* output buffer, must be long enough */
int style
) {
int c;
while (bytes > 0) {
c = *(unsigned char *)data++;
coded += sanitize_char(c, coded, style);
--bytes;
}
return coded;
}
/* copies a substring out of a given buff
returns scratch, \0 terminated; scratch must provide len+1 bytes
*/
char *xiosubstr(char *scratch, const char *str, size_t from, size_t len) {
char *scratch0 = scratch;
str += from;
while (len--) {
*scratch++ = *str++;
}
*scratch = '\0';
return scratch0;
}
/* since version 1.7.2.4 socat supports C-99 behaviour of snprintf but still
can handle the old glibc case with -1 return on truncation.
Do not rely on exact return value in case of truncation
*/
int xio_snprintf(char *str, size_t size, const char *format, ...) {
va_list ap;
int result;
va_start(ap, format);
result = vsnprintf(str, size, format, ap);
#if ! HAVE_C99_SNPRINTF
if (result < 0) {
result = size+63; /* indicate truncation with just some guess */
}
#endif /* !HAVE_C99_SNPRINTF */
va_end(ap);
return result;
}
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