[PATCH v14 03/13] utf8: add function to align a string into given strbuf
From: Karthik Nayak <hidden>
Date: 2016-06-15 23:06:20
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add strbuf_utf8_align() which will align a given string into a strbuf as per given align_type and width. If the width is greater than the string length then no alignment is performed. Helped-by: Eric Sunshine [off-list ref] Mentored-by: Christian Couder [off-list ref] Mentored-by: Matthieu Moy [off-list ref] Signed-off-by: Karthik Nayak <redacted> --- utf8.c | 21 +++++++++++++++++++++ utf8.h | 15 +++++++++++++++ 2 files changed, 36 insertions(+)
diff --git a/utf8.c b/utf8.c
index 28e6d76..00e10c8 100644
--- a/utf8.c
+++ b/utf8.c@@ -644,3 +644,24 @@ int skip_utf8_bom(char **text, size_t len) *text += strlen(utf8_bom); return 1; } + +void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width, + const char *s) +{ + int slen = strlen(s); + int display_len = utf8_strnwidth(s, slen, 0); + int utf8_compensation = slen - display_len; + + if (display_len >= width) { + strbuf_addstr(buf, s); + return; + } + + if (position == ALIGN_LEFT) + strbuf_addf(buf, "%-*s", width + utf8_compensation, s); + else if (position == ALIGN_MIDDLE) { + int left = (width - display_len) / 2; + strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s); + } else if (position == ALIGN_RIGHT) + strbuf_addf(buf, "%*s", width + utf8_compensation, s); +}
diff --git a/utf8.h b/utf8.h
index 5a9e94b..7930b44 100644
--- a/utf8.h
+++ b/utf8.h@@ -55,4 +55,19 @@ int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding); */ int is_hfs_dotgit(const char *path); +typedef enum { + ALIGN_LEFT, + ALIGN_MIDDLE, + ALIGN_RIGHT +} align_type; + +/* + * Align the string given and store it into a strbuf as per the + * 'position' and 'width'. If the given string length is larger than + * 'width' than then the input string is not truncated and no + * alignment is done. + */ +void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width, + const char *s); + #endif
--
2.5.0