131 lines
4.6 KiB
C
131 lines
4.6 KiB
C
/* stringlib: locale related helpers implementation */
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#ifndef STRINGLIB_LOCALEUTIL_H
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#define STRINGLIB_LOCALEUTIL_H
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#include <locale.h>
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/**
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* _Py_InsertThousandsGrouping:
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* @buffer: A pointer to the start of a string.
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* @n_buffer: The length of the string.
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* @n_digits: The number of digits in the string, in which we want
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* to put the grouping chars.
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* @buf_size: The maximum size of the buffer pointed to by buffer.
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* @count: If non-NULL, points to a variable that will receive the
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* number of characters we need to insert (and no formatting
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* will actually occur).
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* @append_zero_char: If non-zero, put a trailing zero at the end of
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* of the resulting string, if and only if we modified the
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* string.
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*
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* Inserts thousand grouping characters (as defined in the current
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* locale) into the string between buffer and buffer+n_digits. If
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* count is non-NULL, don't do any formatting, just count the number
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* of characters to insert. This is used by the caller to
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* appropriately resize the buffer, if needed. If count is non-NULL,
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* buffer can be NULL (it is not dereferenced at all in that case).
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*
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* Return value: 0 on error, else 1. Note that no error can occur if
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* count is non-NULL.
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*
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* This name won't be used, the includer of this file should define
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* it to be the actual function name, based on unicode or string.
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**/
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int
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_Py_InsertThousandsGrouping(STRINGLIB_CHAR *buffer,
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Py_ssize_t n_buffer,
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Py_ssize_t n_digits,
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Py_ssize_t buf_size,
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Py_ssize_t *count,
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int append_zero_char)
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{
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struct lconv *locale_data = localeconv();
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const char *grouping = locale_data->grouping;
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const char *thousands_sep = locale_data->thousands_sep;
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Py_ssize_t thousands_sep_len = strlen(thousands_sep);
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STRINGLIB_CHAR *pend = NULL; /* current end of buffer */
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STRINGLIB_CHAR *pmax = NULL; /* max of buffer */
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char current_grouping;
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Py_ssize_t remaining = n_digits; /* Number of chars remaining to
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be looked at */
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/* Initialize the character count, if we're just counting. */
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if (count)
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*count = 0;
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else {
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/* We're not just counting, we're modifying buffer */
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pend = buffer + n_buffer;
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pmax = buffer + buf_size;
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}
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/* Starting at the end and working right-to-left, keep track of
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what grouping needs to be added and insert that. */
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current_grouping = *grouping++;
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/* If the first character is 0, perform no grouping at all. */
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if (current_grouping == 0)
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return 1;
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while (remaining > current_grouping) {
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/* Always leave buffer and pend valid at the end of this
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loop, since we might leave with a return statement. */
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remaining -= current_grouping;
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if (count) {
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/* We're only counting, not touching the memory. */
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*count += thousands_sep_len;
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}
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else {
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/* Do the formatting. */
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STRINGLIB_CHAR *plast = buffer + remaining;
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/* Is there room to insert thousands_sep_len chars? */
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if (pmax - pend < thousands_sep_len)
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/* No room. */
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return 0;
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/* Move the rest of the string down. */
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memmove(plast + thousands_sep_len,
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plast,
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(pend - plast) * sizeof(STRINGLIB_CHAR));
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/* Copy the thousands_sep chars into the buffer. */
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#if STRINGLIB_IS_UNICODE
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/* Convert from the char's of the thousands_sep from
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the locale into unicode. */
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{
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Py_ssize_t i;
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for (i = 0; i < thousands_sep_len; ++i)
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plast[i] = thousands_sep[i];
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}
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#else
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/* No conversion, just memcpy the thousands_sep. */
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memcpy(plast, thousands_sep, thousands_sep_len);
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#endif
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}
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/* Adjust end pointer. */
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pend += thousands_sep_len;
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/* Move to the next grouping character, unless we're
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repeating (which is designated by a grouping of 0). */
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if (*grouping != 0) {
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current_grouping = *grouping++;
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if (current_grouping == CHAR_MAX)
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/* We're done. */
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break;
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}
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}
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if (append_zero_char) {
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/* Append a zero character to mark the end of the string,
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if there's room. */
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if (pend - (buffer + remaining) < 1)
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/* No room, error. */
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return 0;
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*pend = 0;
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}
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return 1;
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}
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#endif /* STRINGLIB_LOCALEUTIL_H */
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