diff options
Diffstat (limited to 'util/strgutil.c')
| -rw-r--r-- | util/strgutil.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/util/strgutil.c b/util/strgutil.c index 0791dbbfa..5193df0f8 100644 --- a/util/strgutil.c +++ b/util/strgutil.c @@ -1048,6 +1048,77 @@ utf8_to_native( const char *string, size_t length, int delim ) } } +/* This is similar to native_to_utf8, except it can take any input + (which may or may not be UTF8 encoded) and return something that is + (almost) definitely UTF8. This code is mostly borrowed from + GPA. */ + +char * +string_to_utf8 (const char *string) +{ + const char *s; + + if (!string) + return NULL; + + /* Due to a bug in old and not so old PGP versions user IDs have + been copied verbatim into the key. Thus many users with Umlauts + et al. in their name will see their names garbled. Although this + is not an issue for me (;-)), I have a couple of friends with + Umlauts in their name, so let's try to make their life easier by + detecting invalid encodings and convert that to Latin-1. We use + this even for X.509 because it may make things even better given + all the invalid encodings often found in X.509 certificates. */ + for (s = string; *s && !(*s & 0x80); s++) + ; + if (*s && ((s[1] & 0xc0) == 0x80) && ( ((*s & 0xe0) == 0xc0) + || ((*s & 0xf0) == 0xe0) + || ((*s & 0xf8) == 0xf0) + || ((*s & 0xfc) == 0xf8) + || ((*s & 0xfe) == 0xfc)) ) + { + /* Possible utf-8 character followed by continuation byte. + Although this might still be Latin-1 we better assume that it + is valid utf-8. */ + return xstrdup (string); + } + else if (*s && !strchr (string, 0xc3)) + { + size_t length=0; + char *buffer,*p; + + /* No 0xC3 character in the string; assume that it is Latin-1. */ + + for(s=string; *s; s++ ) + { + length++; + if( *s & 0x80 ) + length++; + } + buffer = xmalloc( length + 1 ); + for(p=buffer, s=string; *s; s++ ) + { + if( *s & 0x80 ) + { + *p++ = 0xc0 | ((*s >> 6) & 3); + *p++ = 0x80 | ( *s & 0x3f ); + } + else + *p++ = *s; + } + *p = 0; + + return buffer; + } + else + { + /* Everything else is assumed to be UTF-8. We do this even that + we know the encoding is not valid. However as we only test + the first non-ascii character, valid encodings might + follow. */ + return xstrdup (string); + } +} /* Same as asprintf but return an allocated buffer suitable to be freed using xfree. This function simply dies on memory failure, |