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Calling a function with incorrect arguments can result in unexpected or unintended program behavior. Functions that are appropriately declared \[[DCL07-A. Include the appropriate type information in function declarators]\] will fail compilation if they are supplied with the wrong number or types of arguments. However, there are cases where supplying the incorrect arguments to a function will only generate compiler warnings. These warnings should be resolved \[[MSC00-A. Compile cleanly at high warning levels]\], but do not prevent program compilation. |
Non-Compliant Code Example: (function pointers)
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#include <stdio.h>
extern char *strchr();
char *(*fp) ();
int main(void) {
char *c;
fp = strchr;
c = fp(12,2);
printf("%s\n",c);
}
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Compliant Solution: (function pointers)
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extern char *strchr();
char *(*fp) ();
int main(void) {
char *c;
fp = strchr;
c = fp(12,2);
printf("%s\n",c);
}
|
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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