From 4ad4e6c7f6d2fb414d22dd3e55801c85b02c1af7 Mon Sep 17 00:00:00 2001 From: zlg Date: Sat, 22 Dec 2018 01:23:35 -0800 Subject: Solve Exercise 8-2: fopen and fillbuf --- ch8/8-02_stdlib-fopen-and-fillbuf.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 ch8/8-02_stdlib-fopen-and-fillbuf.c (limited to 'ch8/8-02_stdlib-fopen-and-fillbuf.c') diff --git a/ch8/8-02_stdlib-fopen-and-fillbuf.c b/ch8/8-02_stdlib-fopen-and-fillbuf.c new file mode 100644 index 0000000..2219757 --- /dev/null +++ b/ch8/8-02_stdlib-fopen-and-fillbuf.c @@ -0,0 +1,33 @@ +#include +#include +#include +#include + +/* The C Programming Language: 2nd Edition + * + * Exercise 8-2: Rewrite `fopen` and `_fillbuf` with fields instead of explicit + * bit operations. Compare code size and execution speed. + * + * Notes: This file uses the standard library exclusively, in contrast to the + * partial replacement solution in the other 8-02 files. + * + * The resulting binary of this file executes in about 0.001s, just like the + * partial replacement solution. Its binary is 1KB smaller, however. + */ +int main() { + FILE *fp = fopen("8-02_fopen-and-fillbuf.c", "r"); + if (fp != NULL) { + puts("We could read the file.\n"); + /* pro tip: don't declare this as 'unsigned' or you'll create an + * endless loop thanks to EOF typically being negative. Don't waste + * half an hour on a newbie mistake like I did. :) + */ + char c; + while ((c = getc(fp)) != EOF) { + putchar(c); + } + } else { + puts("Could not open file for reading."); + } + return 0; +} -- cgit v1.2.3-54-g00ecf