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62 Zeilen
1.2 KiB
62 Zeilen
1.2 KiB
#include <defs.h>
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#include <stdio.h>
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#include <syscall.h>
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/* *
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* cputch - writes a single character @c to stdout, and it will
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* increace the value of counter pointed by @cnt.
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* */
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static void
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cputch(int c, int *cnt) {
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sys_putc(c);
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(*cnt) ++;
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}
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/* *
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* vcprintf - format a string and writes it to stdout
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*
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* The return value is the number of characters which would be
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* written to stdout.
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*
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* Call this function if you are already dealing with a va_list.
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* Or you probably want cprintf() instead.
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* */
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int
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vcprintf(const char *fmt, va_list ap) {
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int cnt = 0;
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vprintfmt((void*)cputch, &cnt, fmt, ap);
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return cnt;
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}
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/* *
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* cprintf - formats a string and writes it to stdout
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*
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* The return value is the number of characters which would be
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* written to stdout.
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* */
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int
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cprintf(const char *fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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int cnt = vcprintf(fmt, ap);
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va_end(ap);
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return cnt;
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}
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/* *
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* cputs- writes the string pointed by @str to stdout and
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* appends a newline character.
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* */
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int
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cputs(const char *str) {
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int cnt = 0;
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char c;
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while ((c = *str ++) != '\0') {
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cputch(c, &cnt);
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}
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cputch('\n', &cnt);
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return cnt;
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}
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