diff options
| author | Freya Murphy <freya@freyacat.org> | 2025-04-08 10:39:48 -0400 |
|---|---|---|
| committer | Freya Murphy <freya@freyacat.org> | 2025-04-08 10:39:48 -0400 |
| commit | 8a19547957a86bed3f58c9abc1ac218d04698faf (patch) | |
| tree | ed7ccc6f3a8902915dfe6c9bf763fc45d752b3c4 /kernel/lib/strtox.c | |
| parent | fmt (diff) | |
| download | comus-8a19547957a86bed3f58c9abc1ac218d04698faf.tar.gz comus-8a19547957a86bed3f58c9abc1ac218d04698faf.tar.bz2 comus-8a19547957a86bed3f58c9abc1ac218d04698faf.zip | |
break apart c libaray
Diffstat (limited to 'kernel/lib/strtox.c')
| -rw-r--r-- | kernel/lib/strtox.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/kernel/lib/strtox.c b/kernel/lib/strtox.c new file mode 100644 index 0000000..620b8d3 --- /dev/null +++ b/kernel/lib/strtox.c @@ -0,0 +1,52 @@ +#include <lib.h> + +#define STRTOX(name, type) \ + type name(const char *restrict s, char **restrict endptr, int radix) \ + { \ + const char *s_start = s; \ + for (; isspace(*s); s++) \ + ; \ + \ + int sign = 0; \ + switch (*s) { \ + case '-': \ + sign = 1; /* fallthrough */ \ + case '+': \ + s++; \ + break; \ + } \ + \ + if ((radix == 0 || radix == 16) && \ + (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'))) { \ + radix = 16; \ + s += 2; \ + } else if (radix == 0) { \ + if (*s == '0') { \ + radix = 8; \ + s++; \ + } else { \ + radix = 10; \ + } \ + } \ + \ + type num = 0; \ + int has_digit = 0; \ + \ + while (1) { \ + int n = ctoi(*s++); \ + if (n < 0 || n >= radix) \ + break; \ + has_digit = 1; \ + num = num * radix + n; \ + } \ + \ + if (endptr != NULL) { \ + *endptr = has_digit ? (char *)(s - 1) : (char *)s_start; \ + } \ + \ + return sign ? -num : num; \ + } + +STRTOX(strtoi, int) +STRTOX(strtol, long int) +STRTOX(strtoll, long long int) |