Here is a simple example of reading an entire file into a buffer and using fstat
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/*
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* file-read.c
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*
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* Simple program to read in an entire file into buffer
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* using malloc after determining filesize using fstat.
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*
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* gcc -Wall file-read.c -o file-reader
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <inttypes.h>
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#define FILENAME "mylargefile.txt"
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int main(int argc, char **argv)
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{
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struct stat file_status;
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if(stat(FILENAME, &file_status) != 0){
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perror("ERROR: Could not stat or file does not exist");
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}
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printf("Filesize: %s\n\n",FILENAME);
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printf("b %9jd \n", ((intmax_t)file_status.st_size));
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printf("Kb %9jd \n", ((intmax_t)file_status.st_size) / 1024);
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printf("Mb %9jd \n", (((intmax_t)file_status.st_size) / 1024) / 1024);
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printf("Gb %9jd \n", ((((intmax_t)file_status.st_size) / 1024)/ 1024)/ 1024);
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FILE *fp = fopen (FILENAME, "r");
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char *buffer = NULL;
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buffer = (char *) malloc(file_status.st_size+1); // + null terminator
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if (!fread(buffer, file_status.st_size,1,fp)) {
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perror("ERROR: Could not read file");
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}
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buffer[file_status.st_size+1] = '\0';
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printf("%s\n",buffer);
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fclose(fp);
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free(buffer);
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return 0;
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}
| Attachment | Size |
|---|---|
 file-read.tar.gz | 1.4 MB |
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