65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* builtin_math.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: ariard <ariard@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/03/17 18:54:00 by ariard #+# #+# */
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/* Updated: 2017/03/22 22:26:37 by jhalford ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "minishell.h"
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#define MATHERR_0 "usage: math variable operator(+-/*%) operand"
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#define MATHERR_2 "math: %c: invalid operator"
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#define MATHERR_3 "math: %s: operand must be digits only"
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#define MATHERR_4 "math: division by 0"
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#define MATHERR_5 "math: modulo by 0"
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static char *do_math(char *value, char operator, char *operand)
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{
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long ope1;
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long ope2;
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ope1 = ft_atoi(value);
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ope2 = ft_atoi(operand);
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DG("value %s -> %i", value, ope1);
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DG("operand %s -> %i", operand, ope2);
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if ((operator == '/') && ope2 == 0)
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return (SH_ERR(MATHERR_4) ? NULL : NULL);
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if ((operator == '%') && ope2 == 0)
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return (SH_ERR(MATHERR_5) ? NULL : NULL);
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ope1 = (operator == '+') ? ope1 + ope2 : ope1;
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ope1 = (operator == '-') ? ope1 - ope2 : ope1;
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ope1 = (operator == '/') ? ope1 / ope2 : ope1;
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ope1 = (operator == '*') ? ope1 * ope2 : ope1;
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ope1 = (operator == '%') ? ope1 % ope2 : ope1;
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DG("output=%s (%i)", ft_itoa(ope1), ope1);
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return (ft_itoa(ope1));
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}
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int builtin_math(const char *path, char *const av[], char *const envp[])
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{
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char *value;
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char operator;
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char *operand;
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(void)path;
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(void)envp;
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if (!av || !av[1] || !av[2] || !av[3] || av[4])
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return (SH_ERR(MATHERR_0));
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value = ft_getenv(data_singleton()->local_var, av[1]);
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operator = av[2][0];
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if (!(ft_strchr("+-/*%", operator)))
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return (SH_ERR(MATHERR_2, operator));
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operand = av[3];
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if (!ft_stris(operand, &ft_isdigit))
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return (SH_ERR(MATHERR_3, operand));
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if (!(value = do_math(value, operator, operand)))
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return (1);
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builtin_setenv("setenv", (char *[]){"math", av[1], value, 0}, NULL);
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ft_strdel(&value);
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return (0);
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}
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