implement a fake standard lib function. atoi_fake()

str2IntArry.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

typedef unsigned char  bool;
typedef unsigned short ushort;
typedef unsigned char  uchar;

#define TRUE            1
#define FALSE           0

#define MAX_VID         4094
#define MAX_VLAN        256

static int atoi_fake(const char* string)
{
    int result = 0;
    int ii = 0, cnt = 0;

    for(ii = 0; ii<strlen(string); ii++) {
        if(string[ii] >= '0' && string[ii] <= '9')
            cnt++;
        else
            break;
    }

    for (ii=0; ii<cnt; ii++) {
        result = result + (string[ii]-'0')*pow(10, cnt-ii-1);
    }

    return result;
}

static bool trim2int(ushort* wVidList, char* szbuf, ushort iLen)
{
    ushort wVid = 0;
    ushort cnt = 0;
    ushort j = 0, k = 0;
    short iStart, lNextVal, lBeginVal;

    iStart = 0;

    for (j=0; j<iLen; j++) {
        if ((szbuf[j] >=  '0' && szbuf[j] <= '9') || szbuf[j]  == ',' || szbuf[j]  == '-') {
            if (szbuf[j] == ',' || (j == iLen - 1) ) {
                printf("%s\n", szbuf+iStart);
                wVid = atoi_fake(szbuf + iStart);
                iStart = j + 1;
                if (wVid == 0 || wVid > MAX_VID || cnt>=MAX_VLAN) {
                    printf("L %d, wVid = %d, cnt = %d\n", __LINE__, wVid, cnt);
                    return FALSE;
                }
                wVidList[cnt] = wVid;
                cnt++;
            }
            else if (szbuf[j] == '-')
            {
                printf("lBeginVal = %s\n", szbuf+iStart);
                lBeginVal = atoi_fake(szbuf +iStart);
                iStart = j + 1;
                for (k = j + 1; k < iLen; k++) {
                    if ((szbuf[k] >=  '0' && szbuf[k] <= '9') || szbuf[k]  == ',') {
                        if (szbuf[k] == ',' || (k == iLen - 1) ) {
                            lNextVal = atoi_fake(szbuf +iStart);
                            iStart = k + 1;
                            if (lNextVal < lBeginVal || (lNextVal-lBeginVal >= MAX_VID)) {
                                printf("L %d, wVid = %d, cnt = %d\n", __LINE__, wVid, cnt);
                                return FALSE;
                            }
                            while (lNextVal >= lBeginVal) {
                                wVid = lBeginVal;
                                if (wVid == 0 || wVid > MAX_VID || cnt>=MAX_VLAN) {
                                    printf("L %d, wVid = %d, cnt = %d\n", __LINE__, wVid, cnt);
                                    return FALSE;
                                }
                                wVidList[cnt] = wVid;
                                cnt++;
                                lBeginVal++;
                            }
                            break;
                        }
                    }
                }
                j = k;
            }
        }
    }

    return TRUE;
}

int main(int argc, char** argv)
{
    char  szbuf[256];
    ushort wVidList[256];
    short iLen;

    int ii;

    memset(wVidList, 0, sizeof(wVidList));
    memset(szbuf, 0, sizeof(szbuf));
    strcpy(szbuf, "99,312,113,7-30");
    iLen = strlen(szbuf);

    if (!trim2int(wVidList, szbuf, iLen)) {
        printf("trim2int() failed.");
        return 0xFFFFFFFF;
    }

    puts("");
    puts("Vid List:");

    for (ii = 0; ii<256; ii++)
    {
        if (wVidList[ii] != 0)
            printf("iIndex: %d, wVid: %d\n", ii, wVidList[ii]);
        else
            break;
    }

    system("pause");
    return 0;
}