Working with the Unix OS

C Libraries
"r+"
"w+"
"a+"
"b"
open an existing text file for reading & writing at beginning
open a new text file for reading & writing at beginning
open an existing text file in append mode & allow reading
binary file
int fclose(FILE *stream)
int fflush(FILE *stream)
int fgetc(FILE *stream)
int fputc(int c, FILE *stream)
char *fgets(char *s, int n, FILE *stream)
int fputs(char *s, FILE *stream)
int fprintf(FILE *stream, char *format)
int fscanf(FILE *stream, char *format)
/* random access of file */
long ftell(FILE *stream)
int fseek(FILE *stream, long offset, int wherefrom)
wherefrom = 0 beginning (SEEK_SET)
1 current (SEEK_CUR)
2 end (SEEK_END)
int getc(FILE *stream)
int putc(char c, FILE *stream)
int ungetc(int c, FILE *stream)
int fread(void *buffer, unsigned element size, unsigned count, FILE *stream)
/* read a block of binary data from a stream */
int fwrite(void *buffer, unsigned element size, unsigned count, FILE *stream)
void rewind(FILE *stream)
/* open test.c */
#include
FILE *open_test(void)
FILE *fp;
fp = fopen("test","r");
if (fp == NULL)
fprintf(stderr, "Error opening file test\n");
return fp;
/* if ((fp=fopen("test", "r")) == NULL)
fprintf(stderr, "Error opening file test\n"); */
/* test_copy.c */
#include
#define FAIL 0
#define SUCCESS 1
int copyfile(char *infile, char *outfile)
{
FILE *fp1, *fp2;
if ((fp1=fopen(infile, "r")) == NULL)
return FAIL;
if ((fp2=fopen(outfile,"w")) == NULL)
{ fclose(fp1); return FAIL;
}
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