Patch #774665: Make Python LC_NUMERIC agnostic.

1 files changed, 258 insertions, 0 deletions

diff --git a/Python/pystrtod.c b/Python/pystrtod.c
new file mode 100644
index 0000000000..ab2579982e
--- /dev/null
+++ b/Python/pystrtod.c
@@ -0,0 +1,258 @@
+/* -*- Mode: C; c-file-style: "python" -*- */
+
+#include <Python.h>
+#include <locale.h>
+
+/* ascii character tests (as opposed to locale tests) */
+#define ISSPACE(c)  ((c) == ' ' || (c) == '\f' || (c) == '\n' || \
+                     (c) == '\r' || (c) == '\t' || (c) == '\v')
+#define ISDIGIT(c)  ((c) >= '0' && (c) <= '9')
+#define ISXDIGIT(c) (ISDIGIT(c) || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))
+
+
+/**
+ * PyOS_ascii_strtod:
+ * @nptr:    the string to convert to a numeric value.
+ * @endptr:  if non-%NULL, it returns the character after
+ *           the last character used in the conversion.
+ * 
+ * Converts a string to a #gdouble value.
+ * This function behaves like the standard strtod() function
+ * does in the C locale. It does this without actually
+ * changing the current locale, since that would not be
+ * thread-safe.
+ *
+ * This function is typically used when reading configuration
+ * files or other non-user input that should be locale independent.
+ * To handle input from the user you should normally use the
+ * locale-sensitive system strtod() function.
+ *
+ * If the correct value would cause overflow, plus or minus %HUGE_VAL
+ * is returned (according to the sign of the value), and %ERANGE is
+ * stored in %errno. If the correct value would cause underflow,
+ * zero is returned and %ERANGE is stored in %errno.
+ * 
+ * This function resets %errno before calling strtod() so that
+ * you can reliably detect overflow and underflow.
+ *
+ * Return value: the #gdouble value.
+ **/
+double
+PyOS_ascii_strtod(const char  *nptr, 
+	    char       **endptr)
+{
+	char *fail_pos;
+	double val;
+	struct lconv *locale_data;
+	const char *decimal_point;
+	int decimal_point_len;
+	const char *p, *decimal_point_pos;
+	const char *end = NULL; /* Silence gcc */
+
+/* 	g_return_val_if_fail (nptr != NULL, 0); */
+	assert(nptr != NULL);
+
+	fail_pos = NULL;
+
+	locale_data = localeconv();
+	decimal_point = locale_data->decimal_point;
+	decimal_point_len = strlen(decimal_point);
+
+	assert(decimal_point_len != 0);
+
+	decimal_point_pos = NULL;
+	if (decimal_point[0] != '.' || 
+	    decimal_point[1] != 0)
+	{
+		p = nptr;
+		  /* Skip leading space */
+		while (ISSPACE(*p))
+			p++;
+
+		  /* Skip leading optional sign */
+		if (*p == '+' || *p == '-')
+			p++;
+
+		if (p[0] == '0' && 
+		    (p[1] == 'x' || p[1] == 'X'))
+		{
+			p += 2;
+			  /* HEX - find the (optional) decimal point */
+
+			while (ISXDIGIT(*p))
+				p++;
+
+			if (*p == '.')
+			{
+				decimal_point_pos = p++;
+
+				while (ISXDIGIT(*p))
+					p++;
+
+				if (*p == 'p' || *p == 'P')
+					p++;
+				if (*p == '+' || *p == '-')
+					p++;
+				while (ISDIGIT(*p))
+					p++;
+				end = p;
+			}
+		}
+		else
+		{
+			while (ISDIGIT(*p))
+				p++;
+
+			if (*p == '.')
+			{
+				decimal_point_pos = p++;
+
+				while (ISDIGIT(*p))
+					p++;
+
+				if (*p == 'e' || *p == 'E')
+					p++;
+				if (*p == '+' || *p == '-')
+					p++;
+				while (ISDIGIT(*p))
+					p++;
+				end = p;
+			}
+		}
+		  /* For the other cases, we need not convert the decimal point */
+	}
+
+	  /* Set errno to zero, so that we can distinguish zero results
+	     and underflows */
+	errno = 0;
+
+	if (decimal_point_pos)
+	{
+		char *copy, *c;
+
+		  /* We need to convert the '.' to the locale specific decimal point */
+		copy = malloc(end - nptr + 1 + decimal_point_len);
+
+		c = copy;
+		memcpy(c, nptr, decimal_point_pos - nptr);
+		c += decimal_point_pos - nptr;
+		memcpy(c, decimal_point, decimal_point_len);
+		c += decimal_point_len;
+		memcpy(c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
+		c += end - (decimal_point_pos + 1);
+		*c = 0;
+
+		val = strtod(copy, &fail_pos);
+
+		if (fail_pos)
+		{
+			if (fail_pos > decimal_point_pos)
+				fail_pos = (char *)nptr + (fail_pos - copy) - (decimal_point_len - 1);
+			else
+				fail_pos = (char *)nptr + (fail_pos - copy);
+		}
+
+		free(copy);
+
+	}
+	else
+		val = strtod(nptr, &fail_pos);
+
+	if (endptr)
+		*endptr = fail_pos;
+
+	return val;
+}
+
+
+/**
+ * PyOS_ascii_formatd:
+ * @buffer: A buffer to place the resulting string in
+ * @buf_len: The length of the buffer.
+ * @format: The printf()-style format to use for the
+ *          code to use for converting. 
+ * @d: The #gdouble to convert
+ *
+ * Converts a #gdouble to a string, using the '.' as
+ * decimal point. To format the number you pass in
+ * a printf()-style format string. Allowed conversion
+ * specifiers are 'e', 'E', 'f', 'F', 'g' and 'G'. 
+ * 
+ * Return value: The pointer to the buffer with the converted string.
+ **/
+char *
+PyOS_ascii_formatd(char       *buffer, 
+		   int         buf_len, 
+		   const char *format, 
+		   double      d)
+{
+	struct lconv *locale_data;
+	const char *decimal_point;
+	int decimal_point_len;
+	char *p;
+	int rest_len;
+	char format_char;
+
+/* 	g_return_val_if_fail (buffer != NULL, NULL); */
+/* 	g_return_val_if_fail (format[0] == '%', NULL); */
+/* 	g_return_val_if_fail (strpbrk (format + 1, "'l%") == NULL, NULL); */
+
+	format_char = format[strlen(format) - 1];
+
+/* 	g_return_val_if_fail (format_char == 'e' || format_char == 'E' || */
+/* 			      format_char == 'f' || format_char == 'F' || */
+/* 			      format_char == 'g' || format_char == 'G', */
+/* 			      NULL); */
+
+	if (format[0] != '%')
+		return NULL;
+
+	if (strpbrk(format + 1, "'l%"))
+		return NULL;
+
+	if (!(format_char == 'e' || format_char == 'E' || 
+	      format_char == 'f' || format_char == 'F' || 
+	      format_char == 'g' || format_char == 'G'))
+		return NULL;
+
+
+	PyOS_snprintf(buffer, buf_len, format, d);
+
+	locale_data = localeconv();
+	decimal_point = locale_data->decimal_point;
+	decimal_point_len = strlen(decimal_point);
+
+	assert(decimal_point_len != 0);
+
+	if (decimal_point[0] != '.' || 
+	    decimal_point[1] != 0)
+	{
+		p = buffer;
+
+		if (*p == '+' || *p == '-')
+			p++;
+
+		while (isdigit((unsigned char)*p))
+			p++;
+
+		if (strncmp(p, decimal_point, decimal_point_len) == 0)
+		{
+			*p = '.';
+			p++;
+			if (decimal_point_len > 1) {
+				rest_len = strlen(p + (decimal_point_len - 1));
+				memmove(p, p + (decimal_point_len - 1), 
+					rest_len);
+				p[rest_len] = 0;
+			}
+		}
+	}
+
+	return buffer;
+}
+
+double
+PyOS_ascii_atof(const char *nptr)
+{
+	return PyOS_ascii_strtod(nptr, NULL);
+}