/*
- * getcwidth - Get the OS's idea of the width of a combining character
+ * getcwidth - Get the OS's idea of the width of Unicode codepoints
*
- * This code is Copyright (c) 2012, by the authors of nmh. See the
+ * This code is Copyright (c) 2013, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <wchar.h>
#endif
+#ifdef MULTIBYTE_SUPPORT
+static void usage(char *);
+static void dumpwidth(void);
+static void getwidth(const char *);
+#endif /* MULTIBYTE_SUPPORT */
+
int
main(int argc, char *argv[])
{
+#ifndef MULTIBYTE_SUPPORT
+ (void) argc;
+ (void) argv;
+ fprintf(stderr, "Nmh was not configured with multibyte support\n");
+ exit(1);
+#else /* MULTIBYTE_SUPPORT */
wchar_t c;
- int charlen;
- char *p;
+ int i;
+
+ if (! setlocale(LC_ALL, "")) {
+ fprintf(stderr, "setlocale failed, check your LC_ALL, "
+ "LC_CTYPE, and LANG environment variables\n");
+ }
+
+ if (argc < 2)
+ usage(argv[0]);
+
+ if (strcmp(argv[1], "--dump") == 0) {
+ if (argc == 2) {
+ dumpwidth();
+ exit(0);
+ } else {
+ fprintf(stderr, "--dump cannot be combined with "
+ "other arguments\n");
+ exit(1);
+ }
+ }
/*
- * This is the UTF-8 for "n" + U+0308 (Combining Diaeresis)
+ * Process each argument. If it begins with "U+", then try to
+ * convert it to a Unicode codepoint. Otherwise, take each
+ * string and get the total width
*/
- unsigned char string[] = "n\xcc\x88";
+ for (i = 1; i < argc; i++) {
+ if (strncmp(argv[i], "U+", 2) == 0) {
+ /*
+ * We're making a big assumption here that
+ * wchar_t represents a Unicode codepoint.
+ * That technically isn't valid unless the
+ * C compiler defines __STDC_ISO_10646__, but
+ * we're going to assume now that it works.
+ */
+ errno = 0;
+ c = strtoul(argv[i] + 2, NULL, 16);
+ if (errno) {
+ fprintf(stderr, "Codepoint %s invalid\n",
+ argv[i]);
+ continue;
+ }
+ printf("%d\n", wcwidth(c));
+ } else {
+ getwidth(argv[i]);
+ }
+ }
- setlocale(LC_ALL, "");
+ exit(0);
+}
- if (argc != 1) {
- fprintf(stderr, "Usage: %s\n", argv[0]);
- fprintf(stderr, "Returns the column width of a UTF-8 "
- "multibyte character\n");
- exit(1);
- }
+static void
+usage(char *argv0)
+{
+ fprintf(stderr, "Usage: %s [--dump]\n", argv0);
+ fprintf(stderr, " %s U+XXXX [...]\n", argv0);
+ fprintf(stderr, " %s utf-8-sequence [...]\n", argv0);
+ fprintf(stderr, "Returns the column width of a Unicode codepoint "
+ "or UTF-8 character sequence\n");
+ fprintf(stderr, "\t--dump\tDump complete width table\n");
-#ifndef MULTIBYTE_SUPPORT
- fprintf(stderr, "Nmh was not configured with multibyte support\n");
exit(1);
-#else
+}
+
+static void
+getwidth(const char *string)
+{
+ wchar_t c;
+ int charlen, charleft = strlen(string);
+ int length = 0;
+
/*
- * It's not clear to me that we can just call mbtowc() with a
- * combining character; just to be safe, feed it in a base
- * character first.
+ * In theory we should be able to use wcswidth(), but since we're
+ * testing out how the format libraries behave we'll do it a character
+ * at a time.
*/
mbtowc(NULL, NULL, 0);
- charlen = mbtowc(&c, (char *) string, strlen((char *) string));
+ while (charleft > 0) {
+ int clen;
- if (charlen != 1) {
- fprintf(stderr, "We expected a beginning character length "
- "of 1, got %d instead\n", charlen);
- exit(1);
- }
+ charlen = mbtowc(&c, string, charleft);
+
+ if (charlen == 0)
+ break;
- p = (char *) (string + charlen);
+ if (charlen < 0) {
+ fprintf(stderr, "Unable to convert string \"%s\"\n",
+ string);
+ return;
+ }
- charlen = mbtowc(&c, p, strlen(p));
+ if ((clen = wcwidth(c)) < 0) {
+ fprintf(stderr, "U+%04lX non-printable\n",
+ (unsigned long int) c);
+ return;
+ }
- if (charlen != 2) {
- fprintf(stderr, "We expected a multibyte character length "
- "of 2, got %d instead\n", charlen);
- fprintf(stderr, "Are you using a UTF-8 locale?\n");
- exit(1);
+ length += clen;
+ string += charlen;
+ charleft -= charlen;
}
- printf("%d\n", wcwidth(c));
+ printf("%d\n", length);
+}
- exit(0);
+static void
+dumpwidth(void)
+{
+ wchar_t wc, low;
+ int width, lastwidth;
+
+ for (wc = 0, low = 1, lastwidth = wcwidth(1); wc < 0xffff; wc++) {
+ width = wcwidth(wc+1);
+ if (width != lastwidth) {
+ printf("%04lX - %04lX = %d\n", (unsigned long int) low,
+ (unsigned long int) (wc), lastwidth);
+ low = wc+1;
+ }
+ lastwidth = width;
+ }
+
+ width = wcwidth(wc);
+ if (width == lastwidth)
+ printf("%04lX - %04lX = %d\n", (unsigned long int) low,
+ (unsigned long int) (wc), width);
#endif /* MULTIBYTE_SUPPORT */
}
projects / nmh / blobdiff