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helperlib.c
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helperlib.c
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#include "helperlib.h"
#define MAX_LEN 2000
void print_system_error(char *message)
{
perror(message);
exit(1);
}
void print_user_error(char *message, char *detail)
{
fprintf(stderr, "%s: %s\n", message, detail);
exit(1);
}
/* The comparison scheme is case-insensitive */
int find_str_index(char *strArr[], int numStr, char *str)
{
int index;
for(index = 0; index < numStr; index++)
{
if(strcasecmp(strArr[index], str) == 0)
return index;
}
return -1;
}
/* The comparison scheme is case-sensitive */
int find_occurrence_index(char *str, char character, int occurence)
{
int index, curr_occur;
for(index = 0, curr_occur = 0; str[index] != '\0'; index++)
if(str[index] == character)
{
curr_occur++;
if(curr_occur == occurence)
return index;
}
return -1;
}
/* copy_str_dynamic(...)
*
* Copies the content of the input string to new dynamically allocated memory slots.
*
* Returns a pointer to the beginning of the new memory slots.
* Returns NULL if there is an exception in allocation or copying.
*/
char * copy_str_dynamic(char * originalStr)
{
if(originalStr == NULL)
return NULL;
/* NOTE: Make 1 more SLOT of '\0' !!! */
char * newStrPointer = (char *) malloc((strlen(originalStr) + 1) * sizeof(char));
if(newStrPointer == NULL)
{
printf("error with malloc\n");
return NULL;
}
strcpy(newStrPointer, originalStr);
return newStrPointer;
}
/* count_occurence(...)
*
* Returns the number of occurences of the input character in the given string.
*
* The comparison scheme is case-sensitive.
*/
int count_occurence(char *str, char character)
{
int num = 0, index;
if(str != NULL)
{
for(index = 0; str[index] != '\0'; index++)
if(str[index] == character)
num++;
}
return num;
}
/* read_whole_file(...)
*
* Copies the whole content of a file to a dynamically allocated memory slots.
*
* Returns a pointer to the beginning of the content. Upon sucess, *error_code = 0.
* Returns NULL if there is an error when opening the file or allocating mmemory. If so,
* *error_code = 1 if there is an error opening the file.
* *error_code = 2 if there is an error allocating memory
*
* Note: Users have to free the memory allocated for *error_message themselves
*/
char * read_whole_file(char * relative_path, int *error_code)
{
char *buffer;
int numByte;
printf("Go to function read_whole_file\n");
/* For POSIX conforming system, "r" and "rb" are the same */
FILE *fin = fopen(relative_path, "rb");
if(fin == NULL)
{
*error_code = 1;
return NULL;
}
printf("Valid path OK\n");
/* Set the file position indicator to the end of the stream */
fseek(fin, 0, SEEK_END);
/* Determine the total number of bytes of the stream */
numByte = ftell(fin);
/* Set the file position indicator to the beginning of the stream */
rewind(fin);
printf("Determine size = %d: OK\n", numByte);
buffer = (char *) malloc((numByte + 1) * sizeof(char));
if(buffer == NULL)
{
*error_code = 2;
return NULL;
}
fread(buffer, numByte, 1, fin);
buffer[numByte] = '\0';
printf("Length buffer = %d vs Byte = %d\n", strlen(buffer), numByte);
printf("Read OK\n");
fclose(fin);
printf("Close file OK\n");
/* Upon success, *error_code = 0 */
*error_code = 0;
printf("Totally OK?\n");
puts(buffer);
return buffer;
}
char * generate_html_error_page(char * header, char * error_message)
{
char buffer[MAX_LEN + 1];
sprintf(buffer, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n<html xmlns=\"http://www.w3.org/1999/xhtml\">\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n<title>%s</title>\n</head>\n<body><h1>%s</h1><p>%s</p></body></html>", header, header, error_message);
return copy_str_dynamic(buffer);
}