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author | Daniel Stenberg <daniel@haxx.se> | 2004-03-30 09:06:42 +0000 |
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committer | Daniel Stenberg <daniel@haxx.se> | 2004-03-30 09:06:42 +0000 |
commit | af26fa53f3d73fb70d4e9be973626aab6597b40a (patch) | |
tree | d14125c5d42ff8845a8ccae8c8056750e0d86202 /ares_expand_string.c | |
parent | 155aadf0b3c9d4db338bf4aeca96af9b446ffbcf (diff) | |
download | c-ares-af26fa53f3d73fb70d4e9be973626aab6597b40a.tar.gz c-ares-af26fa53f3d73fb70d4e9be973626aab6597b40a.tar.bz2 c-ares-af26fa53f3d73fb70d4e9be973626aab6597b40a.zip |
Dominick Meglio's new ares_expand_string() function
Diffstat (limited to 'ares_expand_string.c')
-rw-r--r-- | ares_expand_string.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/ares_expand_string.c b/ares_expand_string.c new file mode 100644 index 0000000..135a8d9 --- /dev/null +++ b/ares_expand_string.c @@ -0,0 +1,65 @@ +/* Copyright 1998 by the Massachusetts Institute of Technology. + * + * Permission to use, copy, modify, and distribute this + * software and its documentation for any purpose and without + * fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting + * documentation, and that the name of M.I.T. not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" + * without express or implied warranty. + */ + +#include <sys/types.h> + +#ifdef WIN32 +#include "nameser.h" +#else +#include <netinet/in.h> +#include <arpa/nameser.h> +#endif + +#include <string.h> +#include <stdlib.h> +#include "ares.h" +#include "ares_private.h" /* for the memdebug */ + +/* Simply decodes a length-encoded character string. The first byte of the + * input is the length of the string to be returned and the bytes thereafter + * are the characters of the string. The returned result will be NULL + * terminated. + */ +int ares_expand_string(const unsigned char *encoded, + const unsigned char *abuf, + int alen, + unsigned char **s, + long *enclen) +{ + unsigned char *q; + long len; + if (encoded == abuf+alen) + return ARES_EBADSTR; + + len = *encoded; + if (encoded+len+1 > abuf+alen) + return ARES_EBADSTR; + + encoded++; + + *s = malloc(len+1); + if (*s == NULL) + return ARES_ENOMEM; + q = *s; + strncpy((char *)q, (char *)encoded, len); + q[len] = '\0'; + + *s = q; + + *enclen = len+1; + + return ARES_SUCCESS; +} + |