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I would prefer a variant of the second method. Using
goto to jump to cleanup code is a clean way of handling things.
To improve on this, calling
free on a NULL pointer is a no-op so no need for the extra
void* res1 = NULL, *res2 = NULL, *res3 = NULL;
res1 = malloc(1);
if(res1 == NULL)
goto lbl_clean_up; //operation failed
res2 = malloc(1);
if(res2 == NULL)
res3 = malloc(1);
if(res3 == NULL)
It's also good practice to release the resources in the reverse order that they were allocated in. You can further use this when making use of multiple labels. For example:
FILE *f1, *f2, *f3;
f1 = fopen("infile1", "r");
if (f1 == NULL)
f2 = fopen("infile2", "r");
if (f2 == NULL)
f3 = fopen("outfile", "w");
if (f3 == NULL)
// do something
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Only optimize if you need it. If your code runs fine without optimized code, then prioritize readability.
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The speed difference in the case of failed malloc does not matter.
Style 1 has one much more serious problem : multiple returns. Such a functions are (IMO) much more difficult to read and it is much more difficult to change the function return type
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Comments Thanks! That reverse order thing is great to avoid the if statements and keep the code clean. this is wrong. If your code does not work when compiler optimizations are on - it is an obvious sign of the UB. Not optimazed code hides many problems. @P__J__ Who said anything about not using the compiler optimization flags? The question is about readability vs performance.