libc: core: implement strtoimax and strtoumax

lib/libc/core/stdlib/strtoimax.c

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 1990 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. [rescinded 22 July 1999]
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdint.h>
+
+intmax_t strtoimax(
+	const char *restrict ptr,
+	char **restrict endptr,
+	register int base)
+{
+	const char *s = ptr;
+	intmax_t acc;
+	int c;
+	intmax_t cutoff;
+	int neg = 0, any, cutlim;
+
+	do {
+		c = *s++;
+	} while (isspace(c));
+
+	if (c == '-') {
+		neg = 1;
+		c = *s++;
+	} else if (c == '+') {
+		c = *s++;
+	}
+
+	if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) {
+		c = s[1];
+		s += 2;
+		base = 16;
+	}
+
+	if (base == 0) {
+		base = c == '0' ? 8 : 10;
+	}
+
+	cutoff = (intmax_t)INTMAX_MAX / (intmax_t)base;
+	cutlim = (intmax_t)INTMAX_MAX % (intmax_t)base;
+	for (acc = 0, any = 0;; c = *s++) {
+		if (isdigit(c)) {
+			c -= '0';
+		} else if (isalpha(c)) {
+			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
+		} else {
+			break;
+		}
+
+		if (c >= base) {
+			break;
+		}
+
+		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) {
+			any = -1;
+		} else {
+			any = 1;
+			acc *= base;
+			acc += c;
+		}
+	}
+	if (any < 0) {
+		acc = INTMAX_MAX;
+		__set_errno(ERANGE);
+	} else if (neg) {
+		acc = -acc;
+	}
+
+	if (endptr != 0) {
+		*endptr = (char *)(any ? s - 1 : ptr);
+	}
+
+	return (acc);
+}

lib/libc/core/stdlib/strtoumax.c

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 1990 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. [rescinded 22 July 1999]
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdint.h>
+
+uintmax_t strtoumax(
+	const char *restrict ptr,
+	char **restrict endptr,
+	register int base)
+{
+	const char *s = ptr;
+	uintmax_t acc;
+	int c;
+	uintmax_t cutoff;
+	int neg = 0, any, cutlim;
+
+	do {
+		c = *s++;
+	} while (isspace(c));
+
+	if (c == '-') {
+		neg = 1;
+		c = *s++;
+	} else if (c == '+') {
+		c = *s++;
+	}
+
+	if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) {
+		c = s[1];
+		s += 2;
+		base = 16;
+	}
+
+	if (base == 0) {
+		base = c == '0' ? 8 : 10;
+	}
+
+	cutoff = (uintmax_t)UINTMAX_MAX / (uintmax_t)base;
+	cutlim = (uintmax_t)UINTMAX_MAX % (uintmax_t)base;
+	for (acc = 0, any = 0;; c = *s++) {
+		if (isdigit(c)) {
+			c -= '0';
+		} else if (isalpha(c)) {
+			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
+		} else {
+			break;
+		}
+
+		if (c >= base) {
+			break;
+		}
+
+		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) {
+			any = -1;
+		} else {
+			any = 1;
+			acc *= base;
+			acc += c;
+		}
+	}
+	if (any < 0) {
+		acc = UINTMAX_MAX;
+		__set_errno(ERANGE);
+	} else if (neg) {
+		acc = -acc;
+	}
+
+	if (endptr != 0) {
+		*endptr = (char *)(any ? s - 1 : ptr);
+	}
+
+	return (acc);
+}

lib/libc/include/stdlib.h

@@ -2,6 +2,7 @@
 #define STDLIB_H_
 
 #include <stddef.h>
+#include <stdint.h>
 
 extern void abort(void);
 extern void exit(int result);
@@ -27,4 +28,16 @@ extern unsigned long long strtoull(
 	char **restrict str_end,
 	int base);
 
+extern uintmax_t strtoumax(
+	const char *restrict str,
+	char **restrict endptr,
+	int base);
+extern intmax_t strtoimax(
+	const char *restrict str,
+	char **restrict str_end,
+	int base);
+
+extern float strtof(const char *restrict str, char **restrict endptr);
+extern double strtod(const char *restrict str, char **restrict endptr);
+
 #endif