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#include <stdio.h>
#include <stdlib.h>
/*
This program is written to demonstrate the <stdlib.h> library.
This program will demonstrate memory allocation using calloc and realloc.
Written by James M. Rogers
21 March 1999
Released to the Public Domain on this date.
*/
/*
Read in lines from a file, reallocating memory as needed, then freeing when done.
*/
#define SIZE 1024
main(int argv, char *argc[]){
char *file;
char line[SIZE];
FILE *stream;
unsigned int mem_size, file_size, line_size;
mem_size=SIZE;
file_size=0;
if((file=calloc(1,SIZE))==(char *)NULL){
printf("Cannot allocate memory.\n");
exit (1);
}
if((stream=fopen(argc[1], "r")) == (FILE *)NULL){
printf("Cannot open file.");
exit (1);
}
while(fgets(line, SIZE+1, stream) != (char *)NULL) {
printf("%s",line);
line_size=strlen(line);
file_size += line_size;
while(file_size>mem_size) {
mem_size += SIZE;
if ((file=realloc(file, mem_size)) == (char *)NULL){
printf("Cannot allocate memory.\n");
free(file);
fclose(stream);
exit (1);
}
}
strcat(file,line);
printf("allocated memory:%d \t file size:%d \t size of line:%d\n", mem_size, file_size, line_size);
}
printf("%s",file);
fclose(stream);
free(file);
exit (0);
}
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