99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* next_word.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: hulamy <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2020/02/10 13:58:30 by hulamy #+# #+# */
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/* Updated: 2020/02/24 14:33:47 by hulamy ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "ft_printf.h"
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/*
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** -placed outside of "word_length" for lake of space
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** -check if there is a '*' or a number
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** -usefull as such for the 'width', and after a check
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** for a '.' for the 'precision' flag
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*/
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int width_precision(char *s)
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{
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int i;
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i = 0;
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if (ft_strchr("*", s[i]) != NULL)
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i++;
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while (ft_strchr("0123456789", s[i]) != NULL)
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i++;
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return (i);
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}
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/*
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** -return the length of the next word to print
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** -for that it got through the characters expecting
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** in the following order :
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** [%][flags][width][.precision][length][specifier]
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** knowing that 'flags' can repeat themselves
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** -a single '%' is treated as a word of length 1
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** (unlike the real printf)
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** -it's written :
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** i += width_precision(s + i + 1) + 1;
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** instead of :
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** i++;
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** i += width_precision(s + i);
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** to save a line (3 with the brackets)
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*/
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int word_length(char *s)
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{
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int i;
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i = 1;
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if (s[0] == '\0')
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return (0);
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if (s[0] != '%')
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{
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while (s[i] != '%' && s[i] != '\0')
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i++;
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return (i);
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}
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while (ft_strchr("#0- +'", s[i]) != NULL)
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i++;
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i += width_precision(s + i);
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if (ft_strchr(".", s[i]) != NULL)
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i += width_precision(s + i + 1) + 1;
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while (ft_strchr("hl", s[i]) != NULL)
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i++;
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if (ft_strchr("diuxXcspefgn%", s[i]) != NULL)
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i++;
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return (i);
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}
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/*
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** -return the next sequence to be print
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** (either a string, or a conversion)
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** -a single '%' is an error in real printf
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** but is treated as a '%' here
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*/
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char *next_word(char **string)
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{
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char *s;
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char *word;
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int i;
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s = *string;
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if (*s == '\0')
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return (NULL);
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if ((i = word_length(s)) < 0)
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return (NULL);
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word = (char *)malloc(sizeof(char) * (i + 1));
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word[i] = '\0';
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ft_memmove(word, s, i);
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*string += i;
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return (word);
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}
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