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#include <stdio.h>
#include <string.h>
char *(*fp) ();
int main(void) {
char *c;
fp = strchr;
c = fp(12, 2);
printf("%s\n", c);
}
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Note that this example violates recommendation \[[DCL35-C. Do not convert a function pointer to a function of an incompatible type]\]. |
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#include <string.h>
char *(*fp) (char const char *, int);
int main(void) {
char *c;
fp = strchr;
c = fp("Hello",'H');
printf("%s\n", c);
}
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Non-Compliant Code Example: (variadic functions)
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The POSIX function {{open()}} \[[Open Group 04|AA. C References#Open Group 04]\] is a variadic function with the following prototype: |
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int open(char const char *path, int oflag, ... );
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The {{open()}} function accepts a third argument to determine a newly created file's access mode. If {{open()}} is used to create a new file and the third argument is omitted, the file may be created with unintended access permissions \[[FIO06-A. Create files with appropriate access permissions]\]. |
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
References
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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Forward, Section 6.9.1, "Function definitions"
\[[Spinellis 06|AA. C References#Spinellis 06]\] Section 2.6.1, "Incorrect Routine or Arguments" |
