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bstr: add some utility functions

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bstr_strip_ext and bstr_get_ext were taken from find_subfiles.c.

bstr_cut is extended to work like bstr_splice: passing a negative
argument will start counting from the end of the string, e.g.
  bstr_cut("abc", -2) == "bc"
This commit is contained in:
wm4 2012-01-01 17:28:01 +01:00
parent bba96eca42
commit f88674509e
2 changed files with 58 additions and 0 deletions
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41
bstr.c
View File

@ -185,6 +185,19 @@ struct bstr *bstr_splitlines(void *talloc_ctx, struct bstr str)
return r;
}
struct bstr bstr_getline(struct bstr str, struct bstr *rest)
{
int pos = bstrchr(str, '\n');
if (pos < 0)
pos = str.len;
if (rest)
*rest = bstr_cut(str, pos + 1);
str.len = pos;
if (str.len > 0 && str.start[str.len - 1] == '\r')
str.len -= 1;
return str;
}
void bstr_lower(struct bstr str)
{
for (int i = 0; i < str.len; i++)
@ -233,3 +246,31 @@ int bstr_decode_utf8(struct bstr s, struct bstr *out_next)
*out_next = s;
return codepoint;
}
bool bstr_case_startswith(struct bstr s, struct bstr prefix)
{
struct bstr start = bstr_splice(s, 0, prefix.len);
return start.len == prefix.len && bstrcasecmp(start, prefix) == 0;
}
bool bstr_case_endswith(struct bstr s, struct bstr suffix)
{
struct bstr end = bstr_cut(s, -suffix.len);
return end.len == suffix.len && bstrcasecmp(end, suffix) == 0;
}
struct bstr bstr_strip_ext(struct bstr str)
{
int dotpos = bstrrchr(str, '.');
if (dotpos < 0)
return str;
return (struct bstr){str.start, dotpos};
}
struct bstr bstr_get_ext(struct bstr s)
{
int dotpos = bstrrchr(s, '.');
if (dotpos < 0)
return (struct bstr){NULL, 0};
return bstr_splice(s, dotpos + 1, s.len);
}

17
bstr.h
View File

@ -82,8 +82,25 @@ int bstr_decode_utf8(struct bstr str, struct bstr *out_next);
// On error, -1 is returned. On success, it returns a value in the range [1, 4].
int bstr_parse_utf8_code_length(unsigned char b);
// Return the text before the next line break, and return it. Change *rest to
// point to the text following this line break. (rest can be NULL.)
// Unlike bstr_splitlines, possible \r characters coming from files with CR+LF
// line breaks are stripped.
struct bstr bstr_getline(struct bstr str, struct bstr *rest);
bool bstr_case_startswith(struct bstr s, struct bstr prefix);
bool bstr_case_endswith(struct bstr s, struct bstr suffix);
struct bstr bstr_strip_ext(struct bstr str);
struct bstr bstr_get_ext(struct bstr s);
static inline struct bstr bstr_cut(struct bstr str, int n)
{
if (n < 0) {
n += str.len;
if (n < 0)
n = 0;
}
if (n > str.len)
n = str.len;
return (struct bstr){str.start + n, str.len - n};