tidy-html5/src/tmbstr.c

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2011-11-17 02:44:16 +00:00
/* tmbstr.c -- Tidy string utility functions
(c) 1998-2006 (W3C) MIT, ERCIM, Keio University
See tidy.h for the copyright notice.
*/
#include "forward.h"
#include "tmbstr.h"
#include "lexer.h"
/* like strdup but using an allocator */
tmbstr TY_(tmbstrdup)( TidyAllocator *allocator, ctmbstr str )
{
tmbstr s = NULL;
if ( str )
{
uint len = TY_(tmbstrlen)( str );
tmbstr cp = s = (tmbstr) TidyAlloc( allocator, 1+len );
while ( 0 != (*cp++ = *str++) )
/**/;
}
return s;
}
/* like strndup but using an allocator */
tmbstr TY_(tmbstrndup)( TidyAllocator *allocator, ctmbstr str, uint len )
{
tmbstr s = NULL;
if ( str && len > 0 )
{
tmbstr cp = s = (tmbstr) TidyAlloc( allocator, 1+len );
while ( len-- > 0 && (*cp++ = *str++) )
/**/;
*cp = 0;
}
return s;
}
/* exactly same as strncpy */
uint TY_(tmbstrncpy)( tmbstr s1, ctmbstr s2, uint size )
{
if ( s1 != NULL && s2 != NULL )
{
tmbstr cp = s1;
while ( *s2 && --size ) /* Predecrement: reserve byte */
*cp++ = *s2++; /* for NULL terminator. */
*cp = 0;
}
return size;
}
/* Allows expressions like: cp += tmbstrcpy( cp, "joebob" );
*/
uint TY_(tmbstrcpy)( tmbstr s1, ctmbstr s2 )
{
uint ncpy = 0;
while (0 != (*s1++ = *s2++) )
++ncpy;
return ncpy;
}
/* Allows expressions like: cp += tmbstrcat( cp, "joebob" );
*/
uint TY_(tmbstrcat)( tmbstr s1, ctmbstr s2 )
{
uint ncpy = 0;
while ( *s1 )
++s1;
while (0 != (*s1++ = *s2++) )
++ncpy;
return ncpy;
}
/* exactly same as strcmp */
int TY_(tmbstrcmp)( ctmbstr s1, ctmbstr s2 )
{
int c;
while ((c = *s1) == *s2)
{
if (c == '\0')
return 0;
++s1;
++s2;
}
return (*s1 > *s2 ? 1 : -1);
}
/* returns byte count, not char count */
uint TY_(tmbstrlen)( ctmbstr str )
{
uint len = 0;
if ( str )
{
while ( *str++ )
++len;
}
return len;
}
/*
MS C 4.2 (and ANSI C) doesn't include strcasecmp.
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Note that tolower and toupper won't
work on chars > 127.
Neither does ToLower()!
*/
int TY_(tmbstrcasecmp)( ctmbstr s1, ctmbstr s2 )
{
uint c;
while (c = (uint)(*s1), TY_(ToLower)(c) == TY_(ToLower)((uint)(*s2)))
{
if (c == '\0')
return 0;
++s1;
++s2;
}
return (*s1 > *s2 ? 1 : -1);
}
int TY_(tmbstrncmp)( ctmbstr s1, ctmbstr s2, uint n )
{
uint c;
if (s1 == NULL || s2 == NULL)
{
if (s1 == s2)
return 0;
return (s1 == NULL ? -1 : 1);
}
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while ((c = (byte)*s1) == (byte)*s2)
{
if (c == '\0')
return 0;
if (n == 0)
return 0;
++s1;
++s2;
--n;
}
if (n == 0)
return 0;
return (*s1 > *s2 ? 1 : -1);
}
int TY_(tmbstrncasecmp)( ctmbstr s1, ctmbstr s2, uint n )
{
uint c;
while (c = (uint)(*s1), TY_(ToLower)(c) == TY_(ToLower)((uint)(*s2)))
{
if (c == '\0')
return 0;
if (n == 0)
return 0;
++s1;
++s2;
--n;
}
if (n == 0)
return 0;
return (*s1 > *s2 ? 1 : -1);
}
ctmbstr TY_(tmbsubstrn)( ctmbstr s1, uint len1, ctmbstr s2 )
{
uint len2 = TY_(tmbstrlen)(s2);
int ix, diff = len1 - len2;
for ( ix = 0; ix <= diff; ++ix )
{
if ( TY_(tmbstrncmp)(s1+ix, s2, len2) == 0 )
return (ctmbstr) s1+ix;
}
return NULL;
}
ctmbstr TY_(tmbsubstr)( ctmbstr s1, ctmbstr s2 )
{
uint len1 = TY_(tmbstrlen)(s1), len2 = TY_(tmbstrlen)(s2);
int ix, diff = len1 - len2;
for ( ix = 0; ix <= diff; ++ix )
{
if ( TY_(tmbstrncasecmp)(s1+ix, s2, len2) == 0 )
return (ctmbstr) s1+ix;
}
return NULL;
}
/* Transform ASCII chars in string to lower case */
tmbstr TY_(tmbstrtolower)( tmbstr s )
{
tmbstr cp;
for ( cp=s; *cp; ++cp )
*cp = (tmbchar) TY_(ToLower)( *cp );
return s;
}
/* Transform ASCII chars in string to upper case */
tmbstr TY_(tmbstrtoupper)(tmbstr s)
{
tmbstr cp;
for (cp = s; *cp; ++cp)
*cp = (tmbchar)TY_(ToUpper)(*cp);
return s;
}
int TY_(tmbvsnprintf)(tmbstr buffer, size_t count, ctmbstr format, va_list args)
{
int retval;
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#if HAS_VSNPRINTF
retval = vsnprintf(buffer, count - 1, format, args);
/* todo: conditionally null-terminate the string? */
buffer[count - 1] = 0;
#else
retval = vsprintf(buffer, format, args);
#endif /* HAS_VSNPRINTF */
return retval;
}
int TY_(tmbsnprintf)(tmbstr buffer, size_t count, ctmbstr format, ...)
{
int retval;
va_list args;
va_start(args, format);
retval = TY_(tmbvsnprintf)(buffer, count, format, args);
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va_end(args);
return retval;
}
/*
* local variables:
* mode: c
* indent-tabs-mode: nil
* c-basic-offset: 4
* eval: (c-set-offset 'substatement-open 0)
* end:
*/