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sys/fmt: add fmt_is_number()

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This commit is contained in:
Hauke Petersen 2019-12-05 13:57:22 +01:00
parent d9229af9d9
commit ab3669294b
2 changed files with 23 additions and 0 deletions
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14
sys/fmt/fmt.c
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@ -53,6 +53,20 @@ static inline char _to_lower(char c)
return 'a' + (c - 'A'); return 'a' + (c - 'A');
} }
int fmt_is_number(const char *str)
{
if (!str || !*str) {
return 0;
}
for (; *str; str++) {
if (!fmt_is_digit(*str)) {
return 0;
}
}
return 1;
}
size_t fmt_byte_hex(char *out, uint8_t byte) size_t fmt_byte_hex(char *out, uint8_t byte)
{ {
if (out) { if (out) {

9
sys/include/fmt.h
View File

@ -69,6 +69,15 @@ static inline int fmt_is_upper(char c)
return (c >= 'A' && c <= 'Z'); return (c >= 'A' && c <= 'Z');
} }
/**
* @brief Test if the given string is a number (regex `[0-9]+`)
*
* @param[in] str String to test, **must be `\0` terminated**
*
* @return true if @p str solely contains digits, false otherwise
*/
int fmt_is_number(const char *str);
/** /**
* @brief Format a byte value as hex * @brief Format a byte value as hex
* *