utils.c

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/* Capstone Disassembly Engine */
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2015 */
 
#if defined(CAPSTONE_HAS_OSXKERNEL)
#include <Availability.h>
#include <libkern/libkern.h>
#else
#include <stdlib.h>
#endif
#include <string.h>
 
#include "utils.h"
 
// create a cache for fast id lookup
static unsigned short *make_id2insn(const insn_map *insns, unsigned int size)
{
    // NOTE: assume that the max id is always put at the end of insns array
    unsigned short max_id = insns[size - 1].id;
    unsigned short i;
 
    unsigned short *cache = (unsigned short *)cs_mem_calloc(max_id + 1, sizeof(*cache));
 
    for (i = 1; i < size; i++)
        cache[insns[i].id] = i;
 
    return cache;
}
 
// look for @id in @insns, given its size in @max. first time call will update @cache.
// return 0 if not found
unsigned short insn_find(const insn_map *insns, unsigned int max, unsigned int id, unsigned short **cache)
{
    if (id > insns[max - 1].id)
        return 0;
 
    if (*cache == NULL)
        *cache = make_id2insn(insns, max);
 
    return (*cache)[id];
}
 
int name2id(const name_map* map, int max, const char *name)
{
    int i;
 
    for (i = 0; i < max; i++) {
        if (!strcmp(map[i].name, name)) {
            return map[i].id;
        }
    }
 
    // nothing match
    return -1;
}
 
const char *id2name(const name_map* map, int max, const unsigned int id)
{
    int i;
 
    for (i = 0; i < max; i++) {
        if (map[i].id == id) {
            return map[i].name;
        }
    }
 
    // nothing match
    return NULL;
}
 
// count number of positive members in a list.
// NOTE: list must be guaranteed to end in 0
unsigned int count_positive(const uint16_t *list)
{
    unsigned int c;
 
    for (c = 0; list[c] > 0; c++);
 
    return c;
}
 
// count number of positive members in a list.
// NOTE: list must be guaranteed to end in 0
unsigned int count_positive8(const unsigned char *list)
{
    unsigned int c;
 
    for (c = 0; list[c] > 0; c++);
 
    return c;
}
 
char *cs_strdup(const char *str)
{
    size_t len = strlen(str)+ 1;
    void *new = cs_mem_malloc(len);
 
    if (new == NULL)
        return NULL;
 
    return (char *)memmove(new, str, len);
}
 
// we need this since Windows doesn't have snprintf()
int cs_snprintf(char *buffer, size_t size, const char *fmt, ...)
{
    int ret;
 
    va_list ap;
    va_start(ap, fmt);
    ret = cs_vsnprintf(buffer, size, fmt, ap);
    va_end(ap);
 
    return ret;
}
 
bool arr_exist8(unsigned char *arr, unsigned char max, unsigned int id)
{
    int i;
 
    for (i = 0; i < max; i++) {
        if (arr[i] == id)
            return true;
    }
 
    return false;
}
 
bool arr_exist(uint16_t *arr, unsigned char max, unsigned int id)
{
    int i;
 
    for (i = 0; i < max; i++) {
        if (arr[i] == id)
            return true;
    }
 
    return false;
}