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-.Dd January 27 2024
-.Dt U8NEXT 3
-.Os
-.Sh NAME
-.Nm u8next ,
-.Nm u8prev
-.Nd iterate over Unicode codepoints
-.Sh LIBRARY
-.Lb librune
-.Sh SYNOPSIS
-.In utf8.h
-.Ft int
-.Fn u8next "rune *ch" "const char8_t **s" "size_t *n"
-.Ft int
-.Fn u8prev "rune *ch" "const char8_t **s" "const char8_t *start"
-.Sh DESCRIPTION
-The
-.Fn u8next
-function decodes the first rune in the UTF-8 encoded string pointed to by
-.Fa s
-of length
-.Fa n
-and stores the result in
-.Fa ch .
-It then updates
-.Fa s
-to point to the next codepoint in the buffer and updates the length
-.Fa n
-accordingly.
-.Pp
-The
-.Fn u8prev
-function takes a pointer
-.Fa start
-which points to the start of the string instead of a length,
-and updates
-.Fa s
-to point to the previous codepoint in the buffer.
-The rune
-.Fa ch
-is set to UTF-8 codepoint pointed to by
-.Fa s
-after iteration.
-.Pp
-Both of these functions assume the input is valid UTF-8.
-.Sh RETURN VALUES
-The
-.Fn u8next
-and
-.Fn u8prev
-functions return the length of the UTF-8-encoded rune iterated over in
-bytes,
-or 0 at the end of iteration.
-.Sh EXAMPLES
-The following calls to
-.Fn u8next
-iterate over and print all the codepoints in
-.Va s .
-.Bd -literal -offset indent
-#include <rune.h> /* For PRIXRUNE; see rune(3) */
-
-#define STRING u8"Ta’ Ħaġrat"
-
-int w;
-rune ch;
-const char8_t *s = STRING;
-size_t n = sizeof(STRING) - 1;
-
-while (w = u8next(&ch, &s, &n))
-	printf("U+%04" PRIXRUNE ": ‘%.*s’\en", ch, w, s - w);
-.Ed
-.Pp
-The following example is the same as the previous,
-but it uses the
-.Fn u8prev
-function to iterate backwards.
-.Bd -literal -offset indent
-#include <rune.h> /* For PRIXRUNE; see rune(3) */
-
-#define STRING u8"Ta’ Ħaġrat"
-
-int w;
-rune ch;
-const char8_t *s, *start;
-size_t n = sizeof(STRING) - 1;
-
-start = STRING;
-s = start + n;
-
-while (w = u8prev(&ch, &s, start))
-	printf("U+%04" PRIXRUNE ": ‘%.*s’\en", ch, w, s);
-.Ed
-.Sh SEE ALSO
-.Xr rune 3 ,
-.Xr u8gnext 3 ,
-.Xr u8tor 3 ,
-.Xr unicode 7 ,
-.Xr utf\-8 7
-.Sh STANDARDS
-.Rs
-.%A F. Yergeau
-.%D November 2003
-.%R RFC 3629
-.%T UTF-8, a transformation format of ISO 10646
-.Re
-.Sh AUTHORS
-.An Thomas Voss Aq Mt mail@thomasvoss.com