1 /* 2 * This file is licensed under the GPL license. For the full content 3 * of this license, see the COPYING file at the top level of this 4 * source tree. 5 */ 6 7 /* 8 * assertion: 9 * 10 * The function will locate the first occurrence of c (converted to a char) 11 * in the string pointed to by s. The terminating NUL character is 12 * considered to be part of the string. Upon completion, the function will 13 * return a pointer to the byte, or a null pointer if the byte was not found. 14 * 15 * method: 16 * -Generate sample string s1 17 * -Define one char, taking a character from the sample string(char1), one char as NULL(char2) 18 and third character out of the sample string(char3). 19 * -Use strchr for string with char1 and store result in result1. 20 * -Use strchr for string with char2 and store result in result2. 21 * -Use strchr for string with char3 and store result in result3. 22 * -Compare the result1 with pointer to the defined char(char1). 23 * -Compare the result2 with pointer to the defined char(char2). 24 * -Compare result3 with NULL. 25 * -Repeat the above all steps for given number of iterations. 26 */ 27 28 #include <stdio.h> 29 #include <string.h> 30 #include <stdlib.h> 31 #include <unistd.h> 32 #include "posixtest.h" 33 34 #define STRING_MAX_LEN 50000 35 #define STEP_COUNT 2000 36 #define TNAME "strchr/1-1.c" 37 #define SKIP_CHAR 'n' 38 #define MATCH_CHAR 's' 39 40 char *random_string(int len, int char_pos) 41 { 42 int i; 43 char *output_string = malloc(len + 1); 44 if (output_string == NULL) { 45 printf(TNAME " failed to allocate memory\n"); 46 exit(PTS_UNRESOLVED); 47 } 48 for (i = 0; i < len; i++) { 49 output_string[i] = rand() % 254 + 1; 50 /*Add character MATCH_CHAR at char_pos*/ 51 if (i == char_pos) 52 output_string[i] = MATCH_CHAR; 53 /*Avoid adding SKIP_CHAR and MATCH_CHAR in the string*/ 54 else if (output_string[i] == SKIP_CHAR || output_string[i] == MATCH_CHAR) 55 i--; 56 } 57 output_string[len] = '\0'; 58 return output_string; 59 } 60 61 int main(void) 62 { 63 int i, char_pos; 64 65 for (i = 1; i < STRING_MAX_LEN; i += STEP_COUNT) { 66 char *sample_str; 67 char sample_char_1; 68 char sample_char_2 = '\0'; 69 char sample_char_3 = 'n'; 70 char_pos = rand() % i; 71 72 sample_str = random_string(i, char_pos); 73 sample_char_1 = sample_str[char_pos]; 74 75 char *ret_str_1 = strchr(sample_str, sample_char_1); 76 char *ret_str_2 = strchr(sample_str, sample_char_2); 77 char *ret_str_3 = strchr(sample_str, sample_char_3); 78 79 if (ret_str_1 != &sample_str[char_pos]) { 80 printf(TNAME " Test Failed, Failed to return pointer to the byte, when matching" 81 " character is found. Expected: %p, but returned: %p\n", 82 &sample_str[char_pos], ret_str_1); 83 exit(PTS_FAIL); 84 } else if (ret_str_2 != &sample_str[i]) { 85 printf(TNAME " Test Failed, Failed to consider NUL character as a part of the" 86 " string,\n\t\t\t\t so failed to return pointer to the NUL character," 87 " when matching character is found.\n\t\t\t\t Expected: %p," 88 " but returned: %p\n", &sample_str[i - 1], ret_str_2); 89 exit(PTS_FAIL); 90 } else if (ret_str_3 != NULL) { 91 printf(TNAME " Test Failed, Failed to return NULL when character is not found" 92 " in the string. Expected: NULL, but returned: %p\n", ret_str_3); 93 exit(PTS_FAIL); 94 } 95 free(sample_str); 96 } 97 printf(TNAME " Test Passed, First case: character is found, " 98 "so returned pointer to the byte.\n\t\t\t Second case: The" 99 " terminating NUL character is considered as part of the string," 100 " \n\t\t\t\t\tso returned pointer to the NUL character.\n\t\t\t " 101 "Third case: character is not found, so" 102 " NULL pointer is returned.\n"); 103 exit(PTS_PASS); 104 } 105
