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@sjlu sjlu/readfile.c

Created Jun 6, 2013
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
// pretty standard operation on reading files
// into memory. fopen, fseek, etc.
char* read_file(const char *filename)
// open file operation
FILE *file = fopen(filename, "r");
if (file != NULL) // null = no such file
// seek to end to detect how big
// the file is.
fseek(file, 0, SEEK_END);
long size = ftell(file)+1;
fseek(file, 0, SEEK_SET);
// if the file is empty
// it is also very useless
// to us.
if (size == 0)
return NULL;
// take the file contents and place it into a pointer.
char* contents = calloc(size, sizeof(char));
fread(contents, size, 1, file);
// we have to duplicate the contents because when
// we close the file, the contents of where we were
// pointing too also gets freed, which is bad for us.
char* output = strdup(contents);
// free the contents, close the file.
return output;
return NULL;
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