modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/strcpy-1.c (about) 1 /* Copyright (C) 2002 Free Software Foundation. 2 3 Test strcpy with various combinations of pointer alignments and lengths to 4 make sure any optimizations in the library are correct. */ 5 6 #include <string.h> 7 8 #ifndef MAX_OFFSET 9 #define MAX_OFFSET (sizeof (long long)) 10 #endif 11 12 #ifndef MAX_COPY 13 #define MAX_COPY (10 * sizeof (long long)) 14 #endif 15 16 #ifndef MAX_EXTRA 17 #define MAX_EXTRA (sizeof (long long)) 18 #endif 19 20 #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + 1 + MAX_EXTRA) 21 22 /* Use a sequence length that is not divisible by two, to make it more 23 likely to detect when words are mixed up. */ 24 #define SEQUENCE_LENGTH 31 25 26 static union { 27 char buf[MAX_LENGTH]; 28 long long align_int; 29 long double align_fp; 30 } u1, u2; 31 32 main () 33 { 34 int off1, off2, len, i; 35 char *p, *q, c; 36 37 for (off1 = 0; off1 < MAX_OFFSET; off1++) 38 for (off2 = 0; off2 < MAX_OFFSET; off2++) 39 for (len = 1; len < MAX_COPY; len++) 40 { 41 for (i = 0, c = 'A'; i < MAX_LENGTH; i++, c++) 42 { 43 u1.buf[i] = 'a'; 44 if (c >= 'A' + SEQUENCE_LENGTH) 45 c = 'A'; 46 u2.buf[i] = c; 47 } 48 u2.buf[off2 + len] = '\0'; 49 50 p = strcpy (u1.buf + off1, u2.buf + off2); 51 if (p != u1.buf + off1) 52 abort (); 53 54 q = u1.buf; 55 for (i = 0; i < off1; i++, q++) 56 if (*q != 'a') 57 abort (); 58 59 for (i = 0, c = 'A' + off2; i < len; i++, q++, c++) 60 { 61 if (c >= 'A' + SEQUENCE_LENGTH) 62 c = 'A'; 63 if (*q != c) 64 abort (); 65 } 66 67 if (*q++ != '\0') 68 abort (); 69 for (i = 0; i < MAX_EXTRA; i++, q++) 70 if (*q != 'a') 71 abort (); 72 } 73 74 exit (0); 75 }