From the course: Secure Coding in C (2019)

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Solution: Confirming input

Solution: Confirming input - C Tutorial

From the course: Secure Coding in C (2019)

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Solution: Confirming input

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(upbeat music) - [Narrator] This code doesn't do anything potentially dangerous with the input string, but it's still important to handle input properly. At line 18, the value returned by the fgets function is compared with a null constant. This condition is true, only when the input string is null and the program would bail on that condition. Input is filtered starting at line 26 in an endless while loop. The process transfers valid characters from the original input string to a modified string output. For example at line 29, you see the new line character filtered out of the input string and replaced with a null character in output. And at line 35, commas are skipped over in the input string, not copied to the output string. Line 44 provides a backstop to prevent buffer overflow. When variable A is equal to the size constant, which is the size of the buffer, the output buffer is capped with a null character…

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