replacing pieces of string

Question

i\'m doing something like excel, i have something like this:

1         2           3
A1        B1          C1

where it replaces the content for

Answer 1

I think that as may be replaced with values ​​by table lookup by cutting the name simply its corresponding value in the name of the string you want to replace.

E.g

#include 
#include 
#include 


typedef struct pair {
    char key[16];
    int  value;
} Pair;

int main(void){
    Pair var_table[] = { { "A1", 1 }, {"B1", 2}, { "C1", 3 }};//sorted
    size_t size = sizeof(var_table)/sizeof(*var_table);
    char input[256] = "A1+B1+C1";
    char outbuff[4096];
    char *p;
    int offset = 0;

    printf("This -> %s\n\n", input);
    for(p=input;*p;){
        Pair *var;
        char op, *opp;

        opp=strpbrk(p, "+-*/");
        if(opp){
            op = *opp;
            *opp = '\0';//cut string at op position
        }
        //search key(p)
        var = (Pair*)bsearch(p, var_table, size, sizeof(*var), (int (*)(const void *, const void *))strcmp);
        if(var)//find!
            offset += sprintf(outbuff + offset, "%d", var->value);//or store array? 
        else
            offset += sprintf(outbuff + offset, "%s", "#UNKNOWN_VAR_NAME#");
        if(opp){
            offset += sprintf(outbuff + offset, "%c", op);
            p = opp + 1;
        } else 
            break;
    }
    printf("to -> %s\n", outbuff);


    return 0;
}