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Do not attempt to modify a string literal. In the following example, the char pointer p is initialized to the address of the static string. Attempting to modify the string literal result results in undefined behavior.
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As an array initializer, a string literal specifies the initial values of characters in an array (as well as the size of the array). The following code creates a copy of the string literal in the space allocated to the character array a. The string stored in a can be safely modified.
| Code Block |
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char a[] = "string literal"; a[0] = 'S'; |
Consequences
Abnormal program termination.
Denial-of-service attack.
References
- ISO/IEC 9899-1999 Section 6.4.5 String literals
- Summit 95 comp.lang.c FAQ list - Question 1.32