Splint (programming tool)

Splint

Developer(s)	The Splint Developers
Stable release	3.1.2 / July 12, 2007 (2007-07-12)
Repository	github.com/splintchecker/splint
Operating system	Cross-platform
Type	Static code analysis
License	GPL
Website	splint.org

Splint, short for Secure Programming Lint, is a programming tool for statically checking C programs for security vulnerabilities and coding mistakes. Formerly called LCLint, it is a modern version of the Unix lint tool.

Splint has the ability to interpret special annotations to the source code, which gives it stronger checking than is possible just by looking at the source alone. Splint is used by gpsd as part of an effort to design for zero defects.

Splint is free software released under the terms of the GNU General Public License.

Recent development activity on Splint has slowed significantly. According to the CVS at SourceForge, as of September 2012 the most recent change in the repository was in November 2010.

Example

#include <stdio.h>
int main()
{
    char c;
    while (c != 'x');
    {
        c = getchar();
        if (c = 'x')
            return 0;
        switch (c) {
        case '\n':
        case '\r':
            printf("Newline\n");
        default:
            printf("%c",c);
        }
    }
    return 0;
}

Splint's output:

Variable c used before definition
Suspected infinite loop. No value used in loop test (c) is modified by test or loop body.
Assignment of int to char: c = getchar()
Test expression for if is assignment expression: c = 'x'
Test expression for if not boolean, type char: c = 'x'
Fall through case (no preceding break)

Fixed source:

#include <stdio.h>
int main()
{
    int c = 0;  // Added an initial assignment definition.

    while (c != 'x') {
        c = getchar();  // Corrected type of c to int
        if (c == 'x') // Fixed the assignment error to make it a comparison operator.
            return 0;
        switch (c) {
        case '\n':
        case '\r':
            printf("Newline\n");
            break;  // Added break statement to prevent fall-through.
        default:
            printf("%c",c);
            break;  //Added break statement to default catch, out of good practice.
        }
    }
    return 0;
}

See also

• Buffer overflow
• Memory debugger
• Software testing
• List of tools for static code analysis

External links

• Splint (programming tool) on SourceForge