f2380eef05
git-subtree-dir: lcthw-remnants git-subtree-mainline:4107485591git-subtree-split:e172f73c82
136 lines
2.9 KiB
C
136 lines
2.9 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include "dbg.h"
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#define MAX_DATA 100
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int read_string(char **out_string, int max_buffer)
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{
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*out_string = calloc(1, max_buffer + 1);
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check_mem(*out_string);
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char *result = fgets(*out_string, max_buffer, stdin);
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check(result != NULL, "Input error.");
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return 0;
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error:
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if(*out_string) free(*out_string);
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*out_string = NULL;
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return -1;
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}
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int read_int(int *out_int)
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{
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char *input = NULL;
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int rc = read_string(&input, MAX_DATA);
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check(rc == 0, "Failed to read number.");
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*out_int = atoi(input);
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free(input);
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return 0;
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error:
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if(input) free(input);
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return -1;
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}
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int read_scan(const char *fmt, ...)
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{
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int i = 0;
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int rc = 0;
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int *out_int = NULL;
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char *out_char = NULL;
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char **out_string = NULL;
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int max_buffer = 0;
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va_list argp;
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va_start(argp, fmt);
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for(i = 0; fmt[i] != '\0'; i++) {
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if(fmt[i] == '%') {
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i++;
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switch(fmt[i]) {
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case '\0':
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sentinel("Invalid format, you ended with %%.");
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break;
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case 'd':
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out_int = va_arg(argp, int *);
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rc = read_int(out_int);
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check(rc == 0, "Failed to read int.");
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break;
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case 'c':
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out_char = va_arg(argp, char *);
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*out_char = fgetc(stdin);
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break;
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case 's':
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max_buffer = va_arg(argp, int);
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out_string = va_arg(argp, char**);
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rc = read_string(out_string, max_buffer);
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check(rc == 0, "Failed to read string.");
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break;
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default:
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sentinel("Invalid format.");
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}
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} else {
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fgetc(stdin);
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}
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check(!feof(stdin) && !ferror(stdin), "Input error.");
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}
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va_end(argp);
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return 0;
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error:
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va_end(argp);
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return -1;
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}
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int main(int argc, char *argv[])
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{
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char *first_name = NULL;
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char initial = ' ';
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char *last_name = NULL;
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int age = 0;
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printf("What's your first name? ");
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int rc = read_scan("%s", MAX_DATA, &first_name);
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check(rc == 0, "Failed first name.");
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printf("What's your initial? ");
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rc = read_scan("%c\n", &initial);
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check(rc == 0, "Failed initial.");
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printf("What's your last name? ");
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rc = read_scan("%s", MAX_DATA, &last_name);
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check(rc == 0, "Failed last name.");
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printf("How old are you? ");
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rc = read_scan("%d", &age);
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check(rc == 0, "Failed age.");
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printf("---- RESULTS ----\n");
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printf("First Name: %s", first_name);
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printf("Initial: '%c'\n", initial);
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printf("Last Name: %s", last_name);
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printf("Age: %d\n", age);
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free(first_name);
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free(last_name);
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return 0;
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error:
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return -1;
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}
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