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| 1 | +/* stringlib: locale related helpers implementation */ |
| 2 | + |
| 3 | +#ifndef STRINGLIB_LOCALEUTIL_H |
| 4 | +#define STRINGLIB_LOCALEUTIL_H |
| 5 | + |
| 6 | +#include <locale.h> |
| 7 | + |
| 8 | +/** |
| 9 | + * _Py_InsertThousandsGrouping: |
| 10 | + * @buffer: A pointer to the start of a string. |
| 11 | + * @len: The length of the string. |
| 12 | + * @plast: A pointer to the end of of the digits in the string. This |
| 13 | + * may be before the end of the string (if the string contains |
| 14 | + * decimals, for example). |
| 15 | + * @buf_size: The maximum size of the buffer pointed to by buffer. |
| 16 | + * @count: If non-NULL, points to a variable that will receive the |
| 17 | + * number of characters we need to insert (and no formatting |
| 18 | + * will actually occur). |
| 19 | + * @append_zero_char: If non-zero, put a trailing zero at the end of |
| 20 | + * of the resulting string, if and only if we modified the |
| 21 | + * string. |
| 22 | + * |
| 23 | + * Inserts thousand grouping characters (as defined in the current |
| 24 | + * locale) into the string between buffer and plast. If count is |
| 25 | + * non-NULL, don't do any formatting, just count the number of |
| 26 | + * characters to insert. This is used by the caller to appropriately |
| 27 | + * resize the buffer, if needed. |
| 28 | + * |
| 29 | + * Return value: 0 on error, else 1. Note that no error can occur if |
| 30 | + * count is non-NULL. |
| 31 | + * |
| 32 | + * This name won't be used, the includer of this file should define |
| 33 | + * it to be the actual function name, based on unicode or string. |
| 34 | + **/ |
| 35 | +int |
| 36 | +_Py_InsertThousandsGrouping(STRINGLIB_CHAR *buffer, |
| 37 | + Py_ssize_t len, |
| 38 | + STRINGLIB_CHAR *plast, |
| 39 | + Py_ssize_t buf_size, |
| 40 | + Py_ssize_t *count, |
| 41 | + int append_zero_char) |
| 42 | +{ |
| 43 | + struct lconv *locale_data = localeconv(); |
| 44 | + const char *grouping = locale_data->grouping; |
| 45 | + const char *thousands_sep = locale_data->thousands_sep; |
| 46 | + Py_ssize_t thousands_sep_len = strlen(thousands_sep); |
| 47 | + STRINGLIB_CHAR *pend = buffer + len; /* current end of buffer */ |
| 48 | + STRINGLIB_CHAR *pmax = buffer + buf_size; /* max of buffer */ |
| 49 | + char current_grouping; |
| 50 | + |
| 51 | + /* Initialize the character count, if we're just counting. */ |
| 52 | + if (count) |
| 53 | + *count = 0; |
| 54 | + |
| 55 | + /* Starting at plast and working right-to-left, keep track of |
| 56 | + what grouping needs to be added and insert that. */ |
| 57 | + current_grouping = *grouping++; |
| 58 | + |
| 59 | + /* If the first character is 0, perform no grouping at all. */ |
| 60 | + if (current_grouping == 0) |
| 61 | + return 1; |
| 62 | + |
| 63 | + while (plast - buffer > current_grouping) { |
| 64 | + /* Always leave buffer and pend valid at the end of this |
| 65 | + loop, since we might leave with a return statement. */ |
| 66 | + |
| 67 | + plast -= current_grouping; |
| 68 | + if (count) { |
| 69 | + /* We're only counting, not touching the memory. */ |
| 70 | + *count += thousands_sep_len; |
| 71 | + } |
| 72 | + else { |
| 73 | + /* Do the formatting. */ |
| 74 | + |
| 75 | + /* Is there room to insert thousands_sep_len chars? */ |
| 76 | + if (pmax - pend < thousands_sep_len) |
| 77 | + /* No room. */ |
| 78 | + return 0; |
| 79 | + |
| 80 | + /* Move the rest of the string down. */ |
| 81 | + memmove(plast + thousands_sep_len, |
| 82 | + plast, |
| 83 | + (pend - plast) * sizeof(STRINGLIB_CHAR)); |
| 84 | + /* Copy the thousands_sep chars into the buffer. */ |
| 85 | +#if STRINGLIB_IS_UNICODE |
| 86 | + /* Convert from the char's of the thousands_sep from |
| 87 | + the locale into unicode. */ |
| 88 | + { |
| 89 | + Py_ssize_t i; |
| 90 | + for (i = 0; i < thousands_sep_len; ++i) |
| 91 | + plast[i] = thousands_sep[i]; |
| 92 | + } |
| 93 | +#else |
| 94 | + /* No conversion, just memcpy the thousands_sep. */ |
| 95 | + memcpy(plast, thousands_sep, thousands_sep_len); |
| 96 | +#endif |
| 97 | + } |
| 98 | + |
| 99 | + /* Adjust end pointer. */ |
| 100 | + pend += thousands_sep_len; |
| 101 | + |
| 102 | + /* Move to the next grouping character, unless we're |
| 103 | + repeating (which is designated by a grouping of 0). */ |
| 104 | + if (*grouping != 0) { |
| 105 | + current_grouping = *grouping++; |
| 106 | + if (current_grouping == CHAR_MAX) |
| 107 | + /* We're done. */ |
| 108 | + break; |
| 109 | + } |
| 110 | + } |
| 111 | + if (append_zero_char) { |
| 112 | + /* Append a zero character to mark the end of the string, |
| 113 | + if there's room. */ |
| 114 | + if (pend - plast < 1) |
| 115 | + /* No room, error. */ |
| 116 | + return 0; |
| 117 | + *pend = 0; |
| 118 | + } |
| 119 | + return 1; |
| 120 | +} |
| 121 | +#endif /* STRINGLIB_LOCALEUTIL_H */ |
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