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Added optional binary search

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This commit is contained in:
adamdunkels 2006-12-19 09:31:37 +00:00
parent 419c5f3c17
commit 946e11a0fc
1 changed files with 62 additions and 25 deletions
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41
core/loader/symtab.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: symtab.c,v 1.3 2006/12/18 15:27:18 fros4943 Exp $
* @(#)$Id: symtab.c,v 1.4 2006/12/19 09:31:37 adamdunkels Exp $
*/
#include "symtab.h"
@ -37,8 +37,44 @@
#include <string.h>
#define SYMTAB_CONF_BINARY_SEARCH 0
/*---------------------------------------------------------------------------*/
void *
#if SYMTAB_CONF_BINARY_SEARCH
const char *
symtab_lookup(const char *name)
{
int start, middle, end;
int r;
start = 0;
end = sizeof(symbols) / sizeof(struct symbols);
do {
/* Check middle, divide */
middle = (end + start) / 2;
if(symbols[middle].name == NULL) {
return NULL;
}
r = strcmp(name, symbols[middle].name);
if(r == 0) {
return symbols[middle].value;
}
if(end == middle || start == middle) {
return NULL;
}
if(r < 0) {
end = middle;
}
if(r > 0) {
start = middle;
}
} while(1);
}
#else /* SYMTAB_CONF_BINARY_SEARCH */
const char *
symtab_lookup(const char *name)
{
const struct symbols *s;
@ -49,4 +85,5 @@ symtab_lookup(const char *name)
}
return 0;
}
#endif /* SYMTAB_CONF_BINARY_SEARCH */
/*---------------------------------------------------------------------------*/