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/*****************************************************************
* @LICENSE@
*****************************************************************/
/* file: types.c
*
* Finicky type checkers for strings. Return 1 (TRUE) if ok, 0 elsewise.
* Also, finicky type converters (sre_ntoh32() and friends)
*
* CVS $Id: types.c,v 1.6 2003/04/14 16:00:16 eddy Exp $
*/
#include "squidconf.h"
#include <string.h>
#include <ctype.h>
#include "squid.h"
/* Function: IsInt()
*
* Returns TRUE if s points to something that atoi() will parse
* completely and convert to an integer.
*/
int
IsInt(char *s)
{
int hex = 0;
if (s == NULL) {squid_errno = SQERR_PARAMETER; return 0; }
/* skip whitespace */
while (isspace((int) (*s))) s++;
/* skip leading sign */
if (*s == '-' || *s == '+') s++;
/* skip leading conversion signals */
if ((strncmp(s, "0x", 2) == 0 && (int) strlen(s) > 2) ||
(strncmp(s, "0X", 2) == 0 && (int) strlen(s) > 2))
{
s += 2;
hex = 1;
}
else if (*s == '0' && (int) strlen(s) > 1)
s++;
/* examine remainder for garbage chars */
if (!hex)
while (*s != '\0')
{
if (!isdigit((int) (*s))) return 0;
s++;
}
else
while (*s != '\0')
{
if (!isxdigit((int) (*s))) return 0;
s++;
}
return 1;
}
/* Function: IsReal()
*
* Purpose: Returns TRUE if s is a string representation
* of a valid floating point number.
*/
int
IsReal(char *s)
{
int gotdecimal = 0;
int gotexp = 0;
int gotreal = 0;
if (s == NULL) return 0;
while (isspace((int) (*s))) s++; /* skip leading whitespace */
if (*s == '-' || *s == '+') s++; /* skip leading sign */
/* Examine remainder for garbage. Allowed one '.' and
* one 'e' or 'E'; if both '.' and e/E occur, '.'
* must be first.
*/
while (*s != '\0')
{
if (isdigit((int) (*s)))
gotreal++;
else if (*s == '.')
{
if (gotdecimal) return 0; /* can't have two */
if (gotexp) return 0; /* e/E preceded . */
else gotdecimal++;
}
else if (*s == 'e' || *s == 'E')
{
if (gotexp) return 0; /* can't have two */
else gotexp++;
}
else if (isspace((int) (*s)))
break;
s++;
}
while (isspace((int) (*s))) s++; /* skip trailing whitespace */
if (*s == '\0' && gotreal) return 1;
else return 0;
}
/* Function: Byteswap()
*
* Purpose: Swap between big-endian and little-endian.
* For example:
* int foo = 0x12345678;
* byteswap((char *) &foo, sizeof(int));
* printf("%x\n", foo)
* gives 78563412.
*
* I don't fully understand byte-swapping issues.
* However, I have tested this on chars through floats,
* on various machines:
* SGI IRIX 4.0.5, SunOS 4.1.3, DEC Alpha OSF/1, Alliant
*
* Date: Sun Feb 12 10:26:22 1995
*/
void
Byteswap(char *swap, int nbytes)
{
int x;
char byte;
for (x = 0; x < nbytes / 2; x++)
{
byte = swap[nbytes - x - 1];
swap[nbytes - x - 1] = swap[x];
swap[x] = byte;
}
}
/* Functions: sre_ntoh16(), etc.
* Date: SRE, Sun Dec 31 11:26:53 2000 [St. Louis]
*
* Purpose: Provide functionality of ntohs(), etc; extended
* to 64-bit unsigned ints, and explicitly provided
* in case a machine doesn't have the ntohs()
* family.
*
* If we're using the host functions,
* USE_HOST_BYTESWAP_FUNCTIONS was set to 1 in
* squidconf.h, and we #define'd sre_hton16(x)=hton(x), etc.
* in squid.h. In doing this, we assumed that the
* host functions work on 16- and 32-bit unsigned quantities.
* If for some reason that's not true, set
* USE_HOST_BYTESWAP_FUNCTIONS to 0.
*/
#ifndef USE_HOST_BYTESWAP_FUNCTIONS
sqd_uint16
sre_ntoh16(sqd_uint16 netshort)
{
#ifdef WORDS_BIGENDIAN
return netshort;
#else
Byteswap((char *) &netshort, 2);
return netshort;
#endif
}
sqd_uint32
sre_ntoh32(sqd_uint32 netlong)
{
#ifdef WORDS_BIGENDIAN
return netlong;
#else
Byteswap((char *) &netlong, 4);
return netlong;
#endif
}
sqd_uint16
sre_hton16(sqd_uint16 hostshort)
{
#ifdef WORDS_BIGENDIAN
return hostshort;
#else
Byteswap((char *) &hostshort, 2);
return hostshort;
#endif
}
sqd_uint32
sre_hton32(sqd_uint32 hostlong)
{
#ifdef WORDS_BIGENDIAN
return hostlong;
#else
Byteswap((char *) &hostlong, 4);
return hostlong;
#endif
}
#endif /*USE_HOST_BYTESWAP_FUNCTIONS*/
sqd_uint64
sre_ntoh64(sqd_uint64 net_int64)
{
#ifdef WORDS_BIGENDIAN
return net_int64;
#else
Byteswap((char *) &net_int64, 8);
return net_int64;
#endif
}
sqd_uint64
sre_hton64(sqd_uint64 host_int64)
{
#ifdef WORDS_BIGENDIAN
return host_int64;
#else
Byteswap((char *) &host_int64, 8);
return host_int64;
#endif
}
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