From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/python~3.12/c-api%2Fconversion.html | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 devdocs/python~3.12/c-api%2Fconversion.html (limited to 'devdocs/python~3.12/c-api%2Fconversion.html') diff --git a/devdocs/python~3.12/c-api%2Fconversion.html b/devdocs/python~3.12/c-api%2Fconversion.html new file mode 100644 index 00000000..2d974ed8 --- /dev/null +++ b/devdocs/python~3.12/c-api%2Fconversion.html @@ -0,0 +1,27 @@ +

String conversion and formatting

Functions for number conversion and formatted string output.

+int PyOS_snprintf(char *str, size_t size, const char *format, ...)
+ Part of the Stable ABI.

Output not more than size bytes to str according to the format string format and the extra arguments. See the Unix man page snprintf(3).

+
+int PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
+ Part of the Stable ABI.

Output not more than size bytes to str according to the format string format and the variable argument list va. Unix man page vsnprintf(3).

+

PyOS_snprintf() and PyOS_vsnprintf() wrap the Standard C library functions snprintf() and vsnprintf(). Their purpose is to guarantee consistent behavior in corner cases, which the Standard C functions do not.

The wrappers ensure that str[size-1] is always '\0' upon return. They never write more than size bytes (including the trailing '\0') into str. Both functions require that str != NULL, size > 0, format != NULL and size < INT_MAX. Note that this means there is no equivalent to the C99 n = snprintf(NULL, 0, ...) which would determine the necessary buffer size.

The return value (rv) for these functions should be interpreted as follows:

The following functions provide locale-independent string to number conversions.

+double PyOS_string_to_double(const char *s, char **endptr, PyObject *overflow_exception)
+ Part of the Stable ABI.

Convert a string s to a double, raising a Python exception on failure. The set of accepted strings corresponds to the set of strings accepted by Python’s float() constructor, except that s must not have leading or trailing whitespace. The conversion is independent of the current locale.

If endptr is NULL, convert the whole string. Raise ValueError and return -1.0 if the string is not a valid representation of a floating-point number.

If endptr is not NULL, convert as much of the string as possible and set *endptr to point to the first unconverted character. If no initial segment of the string is the valid representation of a floating-point number, set *endptr to point to the beginning of the string, raise ValueError, and return -1.0.

If s represents a value that is too large to store in a float (for example, "1e500" is such a string on many platforms) then if overflow_exception is NULL return Py_HUGE_VAL (with an appropriate sign) and don’t set any exception. Otherwise, overflow_exception must point to a Python exception object; raise that exception and return -1.0. In both cases, set *endptr to point to the first character after the converted value.

If any other error occurs during the conversion (for example an out-of-memory error), set the appropriate Python exception and return -1.0.

New in version 3.1.

+
+char *PyOS_double_to_string(double val, char format_code, int precision, int flags, int *ptype)
+ Part of the Stable ABI.

Convert a double val to a string using supplied format_code, precision, and flags.

format_code must be one of 'e', 'E', 'f', 'F', 'g', 'G' or 'r'. For 'r', the supplied precision must be 0 and is ignored. The 'r' format code specifies the standard repr() format.

flags can be zero or more of the values Py_DTSF_SIGN, Py_DTSF_ADD_DOT_0, or Py_DTSF_ALT, or-ed together:

  • +Py_DTSF_SIGN means to always precede the returned string with a sign character, even if val is non-negative.
  • +Py_DTSF_ADD_DOT_0 means to ensure that the returned string will not look like an integer.
  • +Py_DTSF_ALT means to apply “alternate” formatting rules. See the documentation for the PyOS_snprintf() '#' specifier for details.

If ptype is non-NULL, then the value it points to will be set to one of Py_DTST_FINITE, Py_DTST_INFINITE, or Py_DTST_NAN, signifying that val is a finite number, an infinite number, or not a number, respectively.

The return value is a pointer to buffer with the converted string or NULL if the conversion failed. The caller is responsible for freeing the returned string by calling PyMem_Free().

New in version 3.1.

+
+int PyOS_stricmp(const char *s1, const char *s2)
+

Case insensitive comparison of strings. The function works almost identically to strcmp() except that it ignores the case.

+
+int PyOS_strnicmp(const char *s1, const char *s2, Py_ssize_t size)
+

Case insensitive comparison of strings. The function works almost identically to strncmp() except that it ignores the case.

+
+

+ © 2001–2023 Python Software Foundation
Licensed under the PSF License.
+ https://docs.python.org/3.12/c-api/conversion.html +

+
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