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print_loading_text.c

#include <stdio.h>
#include <ctype.h>

#define LOAD_INDICATOR(x_ch_ind) \
    x_ch_ind = (x_ch_ind == '\\') ? '|' : \
                (x_ch_ind == '|') ? '/' : \
                (x_ch_ind == '/') ? '-' : \
                (x_ch_ind == '-') ? '\\' : '-'

void print_loading_text(char* str, size_t len) {
    static size_t pos = 0;
    static char loadind = '\\';

    if(str == NULL) {
        pos = 0;
        loadind = '\\';
        return;
    }

    if(pos) 
        str[pos-1] = tolower(str[pos-1]);
    
    if(pos == len) 
        pos = 0;

    str[pos] = toupper(str[pos]);
    pos++;

    printf("[WAIT] %s... %c\r", str, loadind);
    fflush(stdout);

    LOAD_INDICATOR(loadind);
}