The Problem: strcat is unsafe The following code overflows the array name and corrupts memory. // Bad code char name[10]; strncpy(name, "Oualline", sizeof(name)); name[sizeof(name)-1] = '\0'; strcat(name, ", "); strcat(name, "Oualline); // Memory is now corrupt Note: Defining an array using a numeric constant (10) instead of a named constant (NAME_SIZE) is bad programming practice. But it does make the example simpler, so it's good writing practice when explaining a hack.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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The Problem: strcat is unsafe
The following code overflows the array name and corrupts memory.
// Bad code
char name[10];
strncpy(name, "Oualline", sizeof(name));
name[sizeof(name)-1] = '\0';
strcat(name, ", ");
strcat(name, "Oualline);
// Memory is now corrupt
Note: Defining an array using a numeric constant (10) instead of a named
constant (NAME_SIZE) is bad programming practice. But it does make the
example simpler, so it's good writing practice when explaining a hack.

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