105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
#include <stdio.h>
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static int get_flags(struct printf_opt *opt, const char *restrict format)
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{
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int i;
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i = -1;
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opt->flags.diez = 0;
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opt->flags.zero = 0;
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opt->flags.minus = 0;
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opt->flags.space = 0;
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opt->flags.plus = 0;
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while (format[++i] != '\0')
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{
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switch (format[i])
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{
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case '#': opt->flags.diez = 1; break;
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case '0': opt->flags.zero = 1; break;
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case '-': opt->flags.minus = 1; break;
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case ' ': opt->flags.space = 1; break;
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case '+': opt->flags.plus = 1; break;
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default: return (i);
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}
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}
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return (i);
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}
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static int get_width(struct printf_opt *opt, const char *restrict format)
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{
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// Check dynamic width
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if (format[0] == '*') {
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opt->width = va_arg(opt->ap, int);
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return (1);
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}
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// Check error
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int i = -1;
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opt->width = 0;
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if (format[0] == '0')
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return (0);
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// Get static width
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while (format[++i] >= '0' && format[i] <= '9')
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opt->width = (opt->width * 10) + (format[i] - '0');
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return (i);
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}
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static int get_precision(struct printf_opt *opt, const char *restrict format)
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{
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// Wipe old precision:w
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//
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opt->precision = 0;
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// Check if precision is specified
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if (format[0] != '.')
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return (0);
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// Check dynamic precision
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if (format[1] == '*') {
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opt->precision = va_arg(opt->ap, int);
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return (2);
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}
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// Get static precision
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int i = 0;
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while (format[++i] >= '0' && format[i] <= '9')
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opt->precision = (opt->precision * 10) + (format[i] - '0');
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return (i);
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}
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static int get_lenght(struct printf_opt *opt, const char *restrict format)
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{
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opt->lenght = -1;
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switch (format[0])
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{
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case 'h': opt->lenght = (format[1] == 'h') ? 1 : 0; break;
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case 'l': opt->lenght = (format[1] == 'l') ? 3 : 2; break;
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case 'j': opt->lenght = 4; break;
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case 'z': opt->lenght = 5; break;
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case 't': opt->lenght = 6; break;
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default: return (0);
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}
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return ((opt->lenght == 1 || opt->lenght == 3) ? 2 : 1);
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}
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int printf_get_options(struct printf_opt *opt, const char *restrict format)
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{
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int i;
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// Wipe internal format infos
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opt->sign = '\0';
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opt->base[0] = '\0';
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opt->base[1] = '\0';
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// Get generals opetions
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i = get_flags(opt, &format[0]);
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i += get_width(opt, &format[i]);
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i += get_precision(opt, &format[i]);
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i += get_lenght(opt, &format[i]);
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// Check upper case actions
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opt->uppercase = (format[i] == 'X') ? 1 : 0;
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return (i);
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}
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