95 lines
2 KiB
C
95 lines
2 KiB
C
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#include <stdio.h>
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#include <string.h>
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#include <syscall.h>
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#include <syscall-nr.h>
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/* The standard vprintf() function,
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which is like printf() but uses a va_list. */
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int
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vprintf (const char *format, va_list args)
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{
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return vhprintf (STDOUT_FILENO, format, args);
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}
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/* Like printf(), but writes output to the given HANDLE. */
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int
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hprintf (int handle, const char *format, ...)
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{
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va_list args;
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int retval;
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va_start (args, format);
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retval = vhprintf (handle, format, args);
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va_end (args);
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return retval;
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}
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/* Writes string S to the console, followed by a new-line
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character. */
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int
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puts (const char *s)
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{
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write (STDOUT_FILENO, s, strlen (s));
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putchar ('\n');
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return 0;
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}
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/* Writes C to the console. */
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int
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putchar (int c)
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{
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char c2 = c;
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write (STDOUT_FILENO, &c2, 1);
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return c;
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}
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/* Auxiliary data for vhprintf_helper(). */
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struct vhprintf_aux
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{
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char buf[64]; /* Character buffer. */
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char *p; /* Current position in buffer. */
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int char_cnt; /* Total characters written so far. */
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int handle; /* Output file handle. */
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};
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static void add_char (char, void *);
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static void flush (struct vhprintf_aux *);
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/* Formats the printf() format specification FORMAT with
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arguments given in ARGS and writes the output to the given
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HANDLE. */
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int
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vhprintf (int handle, const char *format, va_list args)
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{
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struct vhprintf_aux aux;
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aux.p = aux.buf;
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aux.char_cnt = 0;
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aux.handle = handle;
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__vprintf (format, args, add_char, &aux);
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flush (&aux);
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return aux.char_cnt;
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}
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/* Adds C to the buffer in AUX, flushing it if the buffer fills
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up. */
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static void
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add_char (char c, void *aux_)
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{
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struct vhprintf_aux *aux = aux_;
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*aux->p++ = c;
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if (aux->p >= aux->buf + sizeof aux->buf)
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flush (aux);
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aux->char_cnt++;
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}
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/* Flushes the buffer in AUX. */
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static void
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flush (struct vhprintf_aux *aux)
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{
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if (aux->p > aux->buf)
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write (aux->handle, aux->buf, aux->p - aux->buf);
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aux->p = aux->buf;
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}
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