Implement a Simple Shell Command Parser

Code

#include <stdio.h>

void parse_shell_input(char *str){
    char token[20][101] = {{0}}; 
    int row = 0, col = 0;
    for(int i = 0; str[i] != '\0'; ++i){
        char c = str[i];
        if(c == ' ' || c == '\t'){           
            if(col == 0) continue;          
            token[row][col] = '\0';          
            row++;
            col = 0;
            if(row >= 20) break;            
        } 
        else {
            if(col < 100) token[row][col] = c;
            col++; 
        }
    }

    if(col > 0 && row < 20){
        token[row][col] = '\0';
        row++;
    }

    for(int i = 0; i < row; ++i){
        printf("%s\n", token[i]);
    }
}

int main(void)
{
    char line[101];
    if(!fgets(line, sizeof line, stdin)) return 0;
    for(int i = 0; line[i] != '\0'; ++i){
        if(line[i] == '\n'){ line[i] = '\0'; break; }
    }
    parse_shell_input(line);
    return 0;
}
 

Solving Approach