144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
#include <libc.h>
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#include <stdarg.h>
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int ft_printf(char *fmt, ...)
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{
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va_list ap;
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int d;
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char c, *s;
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va_start(ap, fmt);
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while (*fmt)
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switch(*fmt++) {
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case 's': /* string */
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s = va_arg(ap, char *);
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printf("string %s\n", s);
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break;
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case 'd': /* int */
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d = va_arg(ap, int);
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printf("int %d\n", d);
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break;
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case 'c': /* char */
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/* Note: char is promoted to int. */
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c = va_arg(ap, int);
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printf("char %c\n", c);
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break;
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}
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va_end(ap);
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return (0);
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}
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int main(void)
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{
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char *s;
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char *str;
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char c;
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int i;
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s = "scd";
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str = "bravo";
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c = 'y';
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i = 6;
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ft_printf(s, str, c, i);
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printf("\n", s, str, c, i);
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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ft_printf("\n", );
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printf("\n", );
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return (0);
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}
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// usage :
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// %[flags][width][.precision][length]specifier
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//
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// [specifiers]
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// c character
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// s string of characters
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// p pointer adress
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// d (or i) signed decimal integer
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// i (or d) signed decimal integer
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// u unsigned decimal integer
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// x unsigned hexadecimal integer
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// X unsigned hexadecimal integer (capital letters)
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//( n nothing printed
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//( f decimal floating point
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//( g uses the shorter of %e or %f
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//( e scientific notation (mantissa/exponent) using e
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//((E scientific notation (mantissa/exponent) using E
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//((G uses the shorter of %E or %f
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//((o signed octal
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//
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// [flags]
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// - left-justify within the given field width
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// 0 left-pads the number with zeroes (0) instead of spaces, where
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// padding is specified (see width sub-specifier)
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//( + forces to precede the result with a plus or minus sign even for
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// positive numbers)
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//( (space) if no sign is going to be written, a blank space is inserted
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// before the value)
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//( # used with o, x or X specifiers the value is preceded with 0, 0x
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// or 0X respectively for values different than zero. Used with e,
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// E and f, it forces the written output to contain a decimal point
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// even if no digits would follow. By default, if no digits follow,
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// no decimal point is written. Used with g or G the reult is the
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// same as with e or E but trailing zeros are not removed)
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//
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// [width]
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// (nbr) minimum number of characters to be printed. if the value to be
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// printed is shorter than this number, the result is padded with
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// blank spaces. The value is not truncated even if the result is
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// larger
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// * the width is not specified in the format string, but as an
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// additional integer value arguement preceding the argument that
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// has to be formatted
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//
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// [.precision]
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// .nbr fot integer specifiers (d,i,o,x,X) - precision specifies the
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// minimum number of digits to be written. If the value to be
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// written is shorter than this number, the result is padded with
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// leading zeros. The value is not truncated even if the result is
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// longer. A precision of 0 means that no character is written for
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// the value 0. For e, E and f specifiers − this is the number of
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// digits to be printed after the decimal point. For g and G
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// specifiers − This is the maximum number of significant digits
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// to be printed. For s − this is the maximum number of characters
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// to be printed. By default all characters are printed until the
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// ending null character is encountered. For c type − it has no
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// effect. When no precision is specified, the default is 1. If the
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// period is specified without an explicit value for precision, 0
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// is assumed
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// .* the precision is not specified in the format string, but as an
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// additional integer value argument preceding the argument that
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// has to be formated
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//
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