85 lines
1.5 KiB
C
85 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* https://en.wikipedia.org/wiki/Velthuis */
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#include "compat.h"
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#include "harvard-kyoto.h"
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#include "utf8.h"
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struct encoder_tuple {
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const char *from;
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const char *to;
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};
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static const struct encoder_tuple table[] = {
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{"A", "\u0101"},
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{"I", "\u012b"},
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{"U", "\u016b"},
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{"RR", "\u1e5d"},
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{"R", "\u1e5b"},
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{"LL", "\u1e39"},
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{"L", "\u1e37"},
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{"aa", "\u0101"},
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{"ii", "\u012b"},
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{"uu", "\u016b"},
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{".rr", "\u1e5d"},
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{".r", "\u1e5b"},
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{".ll", "\u1e39"},
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{".l", "\u1e37"},
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{"M", "\u1e43"},
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{"H", "\u1e25"},
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{"G", "\u1e45"},
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{"J", "\u00f1"},
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{"T", "\u1e6d"},
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{"D", "\u1e0d"},
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{"N", "\u1e47"},
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{"S", "\u1e63"},
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{"sh", "\u015b"},
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{"z", "\u015b"}
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};
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static const struct encoder_tuple *find_tuple(const char *text)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(table); i++) {
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if (strncmp(text, table[i].from, strlen(table[i].from)) == 0) {
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return &table[i];
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}
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}
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return NULL;
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}
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int encode_harvard_kyoto_to_iast(const char *text, char **out)
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{
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const char *str = text, *end = str + strlen(str);
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const struct encoder_tuple *tuple;
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char *buf, *dest;
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buf = calloc(1, strlen(text) * 3); /* should be enough */
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if (buf == NULL)
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return ENOMEM;
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dest = buf;
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while (str < end) {
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tuple = find_tuple(str);
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if (tuple) {
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sprintf(dest, "%s", tuple->to);
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str += strlen(tuple->from);
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dest += strlen(tuple->to);
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} else if (strncmp(str, "{}", 2) == 0) {
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str += 2;
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} else {
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sprintf(dest, "%c", *str);
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str++;
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dest++;
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}
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}
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*out = buf;
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return 0;
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}
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