89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
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/*
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* libc-style definitions and functions
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*
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* Copyright 2018 IBM Corp.
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* Author(s): Collin L. Walling <walling@linux.vnet.ibm.com>
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include "libc.h"
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#include "s390-ccw.h"
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/**
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* atoui:
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* @str: the string to be converted.
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*
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* Given a string @str, convert it to an integer. Leading spaces are
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* ignored. Any other non-numerical value will terminate the conversion
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* and return 0. This function only handles numbers between 0 and
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* UINT64_MAX inclusive.
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*
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* Returns: an integer converted from the string @str, or the number 0
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* if an error occurred.
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*/
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uint64_t atoui(const char *str)
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{
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int val = 0;
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if (!str || !str[0]) {
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return 0;
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}
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while (*str == ' ') {
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str++;
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}
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while (*str) {
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if (!isdigit(*(unsigned char *)str)) {
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break;
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}
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val = val * 10 + *str - '0';
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str++;
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}
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return val;
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}
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/**
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* uitoa:
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* @num: an integer (base 10) to be converted.
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* @str: a pointer to a string to store the conversion.
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* @len: the length of the passed string.
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*
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* Given an integer @num, convert it to a string. The string @str must be
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* allocated beforehand. The resulting string will be null terminated and
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* returned. This function only handles numbers between 0 and UINT64_MAX
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* inclusive.
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*
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* Returns: the string @str of the converted integer @num
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*/
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char *uitoa(uint64_t num, char *str, size_t len)
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{
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long num_idx = 1; /* account for NUL */
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uint64_t tmp = num;
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IPL_assert(str != NULL, "uitoa: no space allocated to store string");
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/* Count indices of num */
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while ((tmp /= 10) != 0) {
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num_idx++;
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}
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/* Check if we have enough space for num and NUL */
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IPL_assert(len > num_idx, "uitoa: array too small for conversion");
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str[num_idx--] = '\0';
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/* Convert int to string */
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while (num_idx >= 0) {
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str[num_idx--] = num % 10 + '0';
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num /= 10;
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}
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return str;
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}
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