RolandWH/ceesort
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switch from scanf to safer fgets

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This commit is contained in:
Roland W-H 2022-05-26 15:29:57 +01:00
parent e260cf38dc
commit 38deb15d4d
1 changed files with 14 additions and 4 deletions
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18
src/ceesort.c
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@ -13,6 +13,7 @@
#include <stdbool.h> #include <stdbool.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
inline void quit_err(const char* msg) inline void quit_err(const char* msg)
@ -51,20 +52,28 @@ int main(int argc, char** argv)
} }
int n = argc - 1; int n = argc - 1;
/*
* The line:
* buffer[strcspn(buffer, "\n")] = 0;
* Strips trailing newline, so "2\n" becomes "2"
*/
char choice_str[16]; char choice_str[16];
printf( printf(
"1. Binary search\n" "1. Binary search\n"
"2. Bubble sort\n" "2. Bubble sort\n"
"Please pick a mode of operation: " "Please pick a mode of operation: "
); );
scanf("%s", choice_str); fgets(choice_str, 16, stdin);
choice_str[strcspn(choice_str, "\n")] = 0;
// TODO: Add checking that number is in range // TODO: Add checking that number is in range
while (!isint(choice_str)) while (!isint(choice_str))
{ {
printf("Sorry but you must enter a number between 1 and 2\n"); printf("Sorry but you must enter a number between 1 and 2\n");
printf("Try again: "); printf("Try again: ");
scanf("%s", choice_str); fgets(choice_str, 16, stdin);
choice_str[strcspn(choice_str, "\n")] = 0;
} }
int choice = atoi(choice_str); int choice = atoi(choice_str);
@ -72,11 +81,12 @@ int main(int argc, char** argv)
{ {
char target_str[16]; char target_str[16];
printf("Enter number to search for: "); printf("Enter number to search for: ");
scanf("%s", target_str); fgets(target_str, 16, stdin);
target_str[strcspn(target_str, "\n")] = 0;
while (!isint(target_str)) while (!isint(target_str))
{ {
printf("Sorry but you must enter a whole number, try again: "); printf("Sorry but you must enter a whole number, try again: ");
scanf("%s", target_str); fgets(target_str, 16, stdin);
} }
int target = atoi(target_str); int target = atoi(target_str);