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chooseoperand.c
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chooseoperand.c
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#include "monty.h"
/**
* instructchoose - chooses the right operand
* @structstack: where to save the data
* @tokens: tokens to read
* @lineno: line number
* Return: nothing
*/
void instructchoose(stack_t **structstack, char ***tokens, unsigned int lineno)
{
void (*operand_code)(stack_t **structstack, unsigned int lineno);
size_t iterator;
if (strcmp((*tokens)[0], "push") == 0)
{
for (iterator = 0; (*tokens)[iterator] != NULL; iterator++)
{
if (iterator == 1)
checknumber((*tokens)[iterator], lineno);
}
if (iterator == 1 && (*tokens)[iterator] == NULL)
{
fprintf(stderr, "L%u: usage: push integer\n", lineno);
exit(EXIT_FAILURE);
}
}
operand_code = choose_operand((*tokens)[0]);
if (operand_code != NULL)
operand_code(structstack, lineno);
else
{
fprintf(stderr, "L%u: unknown instruction %s\n", lineno, (*tokens)[0]);
exit(EXIT_FAILURE);
}
}
/**
* checknumber - check whether string is a number
* @n: string no
* @lineno: line mumber
* Return: 0
*/
void checknumber(char *n, unsigned int lineno)
{
size_t i;
for (i = 0; n[i] != '\0'; i++)
{
if (i == 0 && n[i] == '-')
continue;
else if (!((n[i] >= '0' && n[i] <= '9') || (n[i] == '-')))
{
fprintf(stderr, "L%u: usage: push integer\n", lineno);
exit(EXIT_FAILURE);
}
}
num[1] = atoi(n);
}
/**
* choose_operand - choose right op to use
* @code: string number
* Return: nothing
*/
void (*choose_operand(char *code))(stack_t **stack, unsigned int linenumber)
{
int i;
instruction_t opcodes[] = {
{"push", pushstack},
{"pall", pallstack},
{"pint", peekstack},
{"pop", popstack},
{"swap", swapstack},
{"nop", comS},
{"add", addstack},
{"sub", substack},
{"div", divstack},
{"mul", mulstack},
{"mod", modstack},
{"pchar", pchar},
{"pstr", pstr},
{"rotl", rotl},
{"rotr", rotr},
{NULL, NULL}};
if (code[0] == '#')
return (comS);
if (strcmp(code, "stack") == 0)
return (stack);
if (strcmp(code, "queue") == 0)
return (queue);
for (i = 0; opcodes[i].opcode != NULL; i++)
if (strcmp(code, opcodes[i].opcode) == 0)
return (opcodes[i].f);
return (opcodes[i].f);
}