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TEST AS YOU WRITE THE CODE
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Check error returns One often-overlooked defense is to check the error returns from library functions and system calls Return values from input routines such as f read
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and fscanf should always be checked for errors, as should any file open call such as fopen If a read or open fails, computation cannot proceed correctly Checking the return code from output functions like f p r i n t f or fwri t e will catch the error that results from trying to write a file when there is no space left on the disk It may be sufficient to check the return value from fclose, which returns E F if any O error occurred during any operation, and zero otherwise f p = f o p e n ( o u t f i l e , "w"); /a w r i t e output t o o u t f i l e while () f p r i n t f ( f p , ) ; i f (fclose(fp) == EOF) { /a any e r r o r s a/ /a some output e r r o r occurred */
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Output errors can be serious If the file being written is the new version of a precious file, this check will save you from removing the old file if the new one was not wntten successfully The effort of testing as you go is minimal and pays off handsomely Thinking about testing as you write a program will lead to better code, because that's when you know best what the code should do If instead you wait until something breaks, you will probably have forgotten how the code works Working under pressure, you will need to figure it out again, which takes time, and the fixes will be less thorough and more fragile because your refreshed understanding is likely to be incomplete
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Exercise 6-1 Check out these examples at their boundaries, then fix them as necessary according to the principles of style in I and the advice in this chapter
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(a) This is supposed to compute factorials:
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i n t f a c t o r i a1 (i n t n)
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i n t fac; f a c = 1; while (n--1 f a c a= n; return f a c ;
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(b) This is supposed to print the characters of a string one per line:
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i=O; do { putcharcs Ci++l) ; putchar('\nl); ) while (s[i] != ' \ 0 ' ) ;
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TESTING
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(c) This is meant to copy a string from source to destination:
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v o i d strcpy(char adest, char asrc)
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i n t i; f o r (i 0; s r c [ i ] != ' \ O ' ; = dest[i] = src[i]; i++)
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v o i d strncpy(char
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(d) Another string copy, which attempts to copy n characters from s to t:
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char as, i n t n)
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w h i l e (n > 0 && as != ' \ O ' ) a t = as; t++ ; s++ ; n-- ;
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(e) A numerical comparison:
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i f (i j) > p r i n t f ( " % d i s greater than %d\nW, i, j); else p r i n t f ( " % d i s smaller than %d\n", i , j);
(0A character class test:
>= ' A ' i f (c <= cout else cout
&& c <= '2') { 'L') << " f i r s t h a l f o f alphabet";
<< "second h a l f o f alphabet" ;
Exercise 6-2 As we are writing this book in late 1998, the Year 2000 problem looms as perhaps the biggest boundary condition problem ever (a) What dates would you use to check whether a system is likely to work in the year 2000 Supposing that tests are expensive to perform in what order would you do your tests after trying January 1, 2000 itself (b) How would you test the standard function ctirne, which returns a string representation of the date in this form:
F r i Dec 31 23:58:27 EST 1999\n\0
Suppose your program calls ctirne How would you write your code to defend against a flawed implementation