/* ** scanf-test.c ** ** Tests that the scanf family of functions scans and converts its input data ** correctly. ** ** Note: When this program uses conio, it doesn't guard against printing off ** the bottom of the screen. So, you might have a problem on platforms with ** "short" screens. ** ** 2005-01-26, Greg King */ /* Define USE_STDIO, when you want to use the stdio functions. ** Do not define it, when you want to use the conio functions. */ #define USE_STDIO #include #include #ifdef USE_STDIO # define SCANF scanf # define PRINTF printf #else # include /* Unlike other conio input functions, cscanf() echoes what you type. */ # define SCANF cscanf # define PRINTF cprintf #endif #define ARRAYSIZE(a) (sizeof (a) / sizeof (a)[0]) typedef enum { INT, CHAR } TYPE; typedef union { int nvalue; const char *svalue; } VALUE; static const struct { const char *input, *format; int rvalue; TYPE type1; VALUE v1; TYPE type2; VALUE v2; } test_data[] = { /* Input sequences for character specifiers must be less than 80 characters ** long. These format strings are allowwed a maximum of two assignment ** specifications. */ /* Test that literals match, and that they aren't seen as conversions. ** Test that integer specifiers can handle end-of-file. */ {"qwerty Dvorak", "qwerty Dvorak", 0 , INT, {0}, INT, {0}}, {"qwerty" , "qwerty %d%i" , EOF, INT, {0}, INT, {0}}, {"qwerty " , "qwerty %d%i" , EOF, INT, {0}, INT, {0}}, /* Test that integer specifiers scan properly. */ {"qwerty a" , "qwerty %d%i", 0, INT, {0} , INT, {0}}, {"qwerty -" , "qwerty %d%i", 0, INT, {0} , INT, {0}}, {"qwerty -9" , "qwerty %d%i", 1, INT, {-9} , INT, {0}}, {"qwerty -95" , "qwerty %d%i", 1, INT, {-95} , INT, {0}}, {"qwerty -95a" , "qwerty %d%i", 1, INT, {-95} , INT, {0}}, {"qwerty -95a 1", "qwerty %d%i", 1, INT, {-95} , INT, {0}}, {"qwerty -a" , "qwerty %d%i", 0, INT, {0} , INT, {0}}, {"qwerty -95 1" , "qwerty %d%i", 2, INT, {-95} , INT, {1}}, {"qwerty 95 2", "qwerty %i" , 1, INT, {95} , INT, {0}}, {"qwerty -95 +2", "qwerty %x%o", 2, INT, {-0x95}, INT, {02}}, {"qwerty 0X9E 02", "qwerty %i%i", 2, INT, {0x9e} , INT, {2}}, {"qwerty 095 2", "qwerty %i%i", 2, INT, {0} , INT, {95}}, {"qwerty 0e5 2", "qwerty %i%i", 1, INT, {0} , INT, {0}}, /* [String pointers are cast as (int), ** in order to avoid cc65 warnings.] */ /* Test that character specifiers can handle end-of-file. */ {"qwerty" , "qwerty %s%s" , EOF, CHAR, {(int)""}, CHAR, {(int)""}}, {"qwerty ", "qwerty %s%s" , EOF, CHAR, {(int)""}, CHAR, {(int)""}}, {"qwerty" , "qwerty %c%c" , EOF, CHAR, {(int)""}, CHAR, {(int)""}}, {"qwerty ", "qwerty %c%c" , EOF, CHAR, {(int)""}, CHAR, {(int)""}}, {"qwerty" , "qwerty %[ a-z]%c", EOF, CHAR, {(int)""}, CHAR, {(int)""}}, {"qwerty ", "qwerty %[ a-z]%c", EOF, CHAR, {(int)""}, CHAR, {(int)""}}, {"qwerty ", "qwerty%s%s" , EOF, CHAR, {(int)""}, CHAR, {(int)""}}, /* Test that character specifiers scan properly. */ {"123456qwertyasdfghzxcvbn!@#$%^QWERTYASDFGHZXCV" "BN7890-=uiop[]\\jkl;'m,./&*()_+UIOP{}|JKL:\"M<>?", "%79s%79s", 2, CHAR, {(int)"123456qwertyasdfghzxcvbn!@#$%^QWERTYASDFGHZXCV" "BN7890-=uiop[]\\jkl;'m,./&*()_+UIO"}, CHAR, {(int)"P{}|JKL:\"M<>?"}}, {"qwerty ", "qwerty%c%c" , 2, CHAR, {(int)" "} , CHAR, {(int)" "}}, {"qwerty ", "qwerty%2c%c" , 2, CHAR, {(int)" "} , CHAR, {(int)" "}}, {"qwerty ", "qwerty%2c%2c" , 1, CHAR, {(int)" "} , CHAR, {(int)" "}}, {"qwerty ", "qwerty%[ a-z]%c", 1, CHAR, {(int)" "}, CHAR, {(int)""}}, {"qwerty q", "qwerty%[ a-z]%c", 1, CHAR, {(int)" q"}, CHAR, {(int)""}}, {"qwerty Q", "qwerty%[ a-z]%c", 2, CHAR, {(int)" "}, CHAR, {(int)"Q"}}, {"qwerty-QWERTY-", "%[q-ze-]%[-A-Z]" , 2, CHAR, {(int)"qwerty-"}, CHAR, {(int)"QWERTY-"}}, /* Test the space-separation of strings. */ {"qwerty qwerty" , "qwerty%s%s", 1, CHAR, {(int)"qwerty"}, CHAR, {(int)""}}, {"qwerty qwerty Dvorak", "qwerty%s%s", 2, CHAR, {(int)"qwerty"}, CHAR, {(int)"Dvorak"}}, /* Test the mixxing of types. */ {"qwerty abc3", "qwerty%s%X" , 1, CHAR, {(int)"abc3"} , INT , {0}}, {"qwerty abc3", "qwerty%[ a-z]%X" , 2, CHAR, {(int)" abc"} , INT , {3}}, {"qwerty abc3", "qwerty%[ a-z3]%X", 1, CHAR, {(int)" abc3"}, INT , {0}}, {"qwerty abc3", "qwerty%[ A-Z]%X" , 2, CHAR, {(int)" "} , INT , {0xabc3}}, {"qwerty 3abc", "qwerty%i%[ a-z]" , 2, INT , {3} , CHAR, {(int)"abc"}}, {"qwerty 3abc", "qwerty%i%[ A-Z]" , 1, INT , {3} , CHAR, {(int)""}}, /* Test the character-count specifier. */ {" 95 5", "%n%i" , 1, INT , {0} , INT, {95}}, {" a5 5", "%n%i" , 0, INT , {0} , INT, {0}}, {" a5 5", "%x%n" , 1, INT , {0xa5} , INT, {4}}, {" a5 5", " %4c%n", 1, CHAR, {(int)"a5 5"}, INT, {6}}, {" 05a9" , "%i%n" , 1, INT , {5} , INT, {3}}, /* Test assignment-suppression. */ {" 95 6", "%n%*i" , 0, INT , {0} , INT, {0}}, {" a5 6", "%*x%n" , 0, INT , {4} , INT, {0}}, {" a5 6", "%*x%n%o", 1, INT , {4} , INT, {6}}, {" a5 6", " %*4c%d", 0, CHAR, {(int)""}, INT, {0}}, {"The first number is 7. The second number is 8.\n", "%*[ .A-Za-z]%d%*[ .A-Za-z]%d", 2, INT, {7}, INT, {8}}, }; /* Test the char, short, and long specification-modifiers. */ static const struct { const char *input, *format; long value; } type_data[] = { {"+123456789", "%hhd", (signed char)123456789L}, {" 123456789", "%hd" , (unsigned short)123456789L}, {" 123456789", "%ld" , 123456789L}, {"-123456789", "%lld", -123456789L}, }; static void Pause(void) { #ifdef USE_STDIO printf("\n"); #else cprintf("\r\nTap a key to see the next test. "); cgetc(); clrscr(); #endif } int main(void) { long n0; unsigned t; int c, n1 = 12345, n2, n3; char s1[80], s2[80]; void *p1 = main, *p2 = main, *p3 = main, *p4 = main; #ifndef USE_STDIO clrscr(); cursor(1); #endif /* Test that scanf() can recognize percent-signs in the input. ** Test that integer converters skip white-space. ** Test that "%i" can scan a single zero digit (followed by EOF). */ sscanf("% \r\n\f\v\t 0", "%%%i", &n1); if (n1 != 0) PRINTF("sscanf()'s \"%%%%%%i\" couldn't scan either a \"%%\" " "or a single zero digit.\r\n\n"); /* Test scanf()'s return-value: EOF if input ends before the first ** conversion-attempt begins; an assignment-count, otherwise. ** Test that scanf() properly converts and assigns the correct number ** of arguments. */ PRINTF("Testing scanf()'s return-value,\r\nconversions, and assignments...\r\n"); for (t = 0; t < ARRAYSIZE(test_data); ++t) { /* Prefill the arguments with zeroes. */ n1 = n2 = 0; memset(s1, '\0', sizeof s1); memset(s2, '\0', sizeof s2); c=sscanf(test_data[t].input, test_data[t].format, /* Avoid warning messages about different ** pointer-types, by casting them to void-pointers. */ test_data[t].type1 == INT ? (void *)&n1 : (void *)s1, test_data[t].type2 == INT ? (void *)&n2 : (void *)s2); if (c != test_data[t].rvalue) PRINTF("Test #%u returned %d instead of %d.\r\n", t + 1, c, test_data[t].rvalue); if (test_data[t].type1 == INT) { if (test_data[t].v1.nvalue != n1) PRINTF("Test #%u assigned %i, instead of %i,\r\n" "\tto the first argument.\r\n\n", t + 1, n1, test_data[t].v1.nvalue); } else { /* test_data[t].type1 == CHAR */ if (strcmp(test_data[t].v1.svalue, s1)) PRINTF("Test #%u assigned\r\n\"%s\",\r\n" "\tinstead of\r\n\"%s\",\r\n" "\tto the first argument.\r\n\n", t + 1, s1, test_data[t].v1.svalue); } if (test_data[t].type2 == INT) { if (test_data[t].v2.nvalue != n2) PRINTF("Test #%u assigned %i, instead of %i,\r\n" "\tto the second argument.\r\n\n", t + 1, n2, test_data[t].v2.nvalue); } else { /* test_data[t].type2 == CHAR */ if (strcmp(test_data[t].v2.svalue, s2)) PRINTF("Test #%u assigned\r\n\"%s\",\r\n" "\tinstead of\r\n\"%s\",\r\n" "\tto the second argument.\r\n\n", t + 1, s2, test_data[t].v2.svalue); } } Pause(); /* Test the char, short, and long specification-modifiers. */ PRINTF("Testing scanf()'s type-modifiers...\r\n"); for (t = 0; t < ARRAYSIZE(type_data); ++t) { n0 = 0L; sscanf(type_data[t].input, type_data[t].format, &n0); if (type_data[t].value != n0) PRINTF("Test #%u assigned %li instead of %li.\r\n", t + 1, n0, type_data[t].value); } Pause(); /* Test that the pointer specification ** can convert what printf() generates. */ PRINTF("Testing \"%%p\"...\r\n"); sprintf(s1, "%p %p %p %p", NULL, NULL, Pause, /* static (program) storage */ &c); /* automatic (stack) storage */ sscanf(s1, "%p%p%p %p", &p1, &p2, &p3, &p4); if (p1 != NULL || p2 != NULL || p3 != (void *)Pause || p4 != (void *)&c) PRINTF("p1 is %p, p2 is %p; they should be %p.\r\n" "scanf() assigned %p to p3, instead of %p.\r\n" "scanf() assigned %p to p4, instead of %p.\r\n", p1, p2, NULL, p3, Pause, p4, &c); /* Test that scanf() can scan typed input. ** Retest that "%i" can decode radix prefixxes. */ do { Pause(); PRINTF("Type 3 signed numbers,\r\n" "separated by white-space:\r\n" "octal decimal hexadecimal\r\n" "? "); c = SCANF("%i %i %i", &n1, &n2, &n3); PRINTF("\r\n\nscanf() returned %i.\r\n" "The numbers are:\r\n" " %+o octal,\r\n" " %+d decimal,\r\n" " %+#X hexadecimal.\r\n", c, n1, n2, n3); } while (c > 0); return 0; }