From 8e704e4107b284bfc1e43f4c698ac0e6c5ae1800 Mon Sep 17 00:00:00 2001 From: Jelmer Vernooij Date: Sun, 19 Oct 2008 12:38:16 +0200 Subject: Move more functions out of util_str.c into the shared util.c. --- lib/util/util.c | 278 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 278 insertions(+) (limited to 'lib/util/util.c') diff --git a/lib/util/util.c b/lib/util/util.c index fc55629c4c..1e7991dbf1 100644 --- a/lib/util/util.c +++ b/lib/util/util.c @@ -27,6 +27,7 @@ #include "system/locale.h" #undef malloc #undef strcasecmp +#undef strncasecmp #undef strdup #undef realloc @@ -559,3 +560,280 @@ _PUBLIC_ void *talloc_check_name_abort(const void *ptr, const char *name) return NULL; } +/** + Trim the specified elements off the front and back of a string. +**/ +_PUBLIC_ bool trim_string(char *s, const char *front, const char *back) +{ + bool ret = false; + size_t front_len; + size_t back_len; + size_t len; + + /* Ignore null or empty strings. */ + if (!s || (s[0] == '\0')) + return false; + + front_len = front? strlen(front) : 0; + back_len = back? strlen(back) : 0; + + len = strlen(s); + + if (front_len) { + while (len && strncmp(s, front, front_len)==0) { + /* Must use memmove here as src & dest can + * easily overlap. Found by valgrind. JRA. */ + memmove(s, s+front_len, (len-front_len)+1); + len -= front_len; + ret=true; + } + } + + if (back_len) { + while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) { + s[len-back_len]='\0'; + len -= back_len; + ret=true; + } + } + return ret; +} + +/** + Find the number of 'c' chars in a string +**/ +_PUBLIC_ _PURE_ size_t count_chars(const char *s, char c) +{ + size_t count = 0; + + while (*s) { + if (*s == c) count++; + s ++; + } + + return count; +} + +/** + Routine to get hex characters and turn them into a 16 byte array. + the array can be variable length, and any non-hex-numeric + characters are skipped. "0xnn" or "0Xnn" is specially catered + for. + + valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n" + + +**/ +_PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len) +{ + size_t i; + size_t num_chars = 0; + uint8_t lonybble, hinybble; + const char *hexchars = "0123456789ABCDEF"; + char *p1 = NULL, *p2 = NULL; + + for (i = 0; i < strhex_len && strhex[i] != 0; i++) { + if (strncasecmp(hexchars, "0x", 2) == 0) { + i++; /* skip two chars */ + continue; + } + + if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i])))) + break; + + i++; /* next hex digit */ + + if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i])))) + break; + + /* get the two nybbles */ + hinybble = PTR_DIFF(p1, hexchars); + lonybble = PTR_DIFF(p2, hexchars); + + if (num_chars >= p_len) { + break; + } + + p[num_chars] = (hinybble << 4) | lonybble; + num_chars++; + + p1 = NULL; + p2 = NULL; + } + return num_chars; +} + +/** + * Parse a hex string and return a data blob. + */ +_PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex) +{ + DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1); + + ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length, + strhex, + strlen(strhex)); + + return ret_blob; +} + + +/** + * Routine to print a buffer as HEX digits, into an allocated string. + */ +_PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer) +{ + int i; + char *hex_buffer; + + *out_hex_buffer = malloc_array_p(char, (len*2)+1); + hex_buffer = *out_hex_buffer; + + for (i = 0; i < len; i++) + slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]); +} + +/** + * talloc version of hex_encode() + */ +_PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len) +{ + int i; + char *hex_buffer; + + hex_buffer = talloc_array(mem_ctx, char, (len*2)+1); + + for (i = 0; i < len; i++) + slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]); + + return hex_buffer; +} + +/** + Unescape a URL encoded string, in place. +**/ + +_PUBLIC_ void rfc1738_unescape(char *buf) +{ + char *p=buf; + + while ((p=strchr(p,'+'))) + *p = ' '; + + p = buf; + + while (p && *p && (p=strchr(p,'%'))) { + int c1 = p[1]; + int c2 = p[2]; + + if (c1 >= '0' && c1 <= '9') + c1 = c1 - '0'; + else if (c1 >= 'A' && c1 <= 'F') + c1 = 10 + c1 - 'A'; + else if (c1 >= 'a' && c1 <= 'f') + c1 = 10 + c1 - 'a'; + else {p++; continue;} + + if (c2 >= '0' && c2 <= '9') + c2 = c2 - '0'; + else if (c2 >= 'A' && c2 <= 'F') + c2 = 10 + c2 - 'A'; + else if (c2 >= 'a' && c2 <= 'f') + c2 = 10 + c2 - 'a'; + else {p++; continue;} + + *p = (c1<<4) | c2; + + memmove(p+1, p+3, strlen(p+3)+1); + p++; + } +} + +/** + varient of strcmp() that handles NULL ptrs +**/ +_PUBLIC_ int strcmp_safe(const char *s1, const char *s2) +{ + if (s1 == s2) { + return 0; + } + if (s1 == NULL || s2 == NULL) { + return s1?-1:1; + } + return strcmp(s1, s2); +} + + +/** +return the number of bytes occupied by a buffer in ASCII format +the result includes the null termination +limited by 'n' bytes +**/ +_PUBLIC_ size_t ascii_len_n(const char *src, size_t n) +{ + size_t len; + + len = strnlen(src, n); + if (len+1 <= n) { + len += 1; + } + + return len; +} + +/** + Set a boolean variable from the text value stored in the passed string. + Returns true in success, false if the passed string does not correctly + represent a boolean. +**/ + +_PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean) +{ + if (strwicmp(boolean_string, "yes") == 0 || + strwicmp(boolean_string, "true") == 0 || + strwicmp(boolean_string, "on") == 0 || + strwicmp(boolean_string, "1") == 0) { + *boolean = true; + return true; + } else if (strwicmp(boolean_string, "no") == 0 || + strwicmp(boolean_string, "false") == 0 || + strwicmp(boolean_string, "off") == 0 || + strwicmp(boolean_string, "0") == 0) { + *boolean = false; + return true; + } + return false; +} + +/** +return the number of bytes occupied by a buffer in CH_UTF16 format +the result includes the null termination +**/ +_PUBLIC_ size_t utf16_len(const void *buf) +{ + size_t len; + + for (len = 0; SVAL(buf,len); len += 2) ; + + return len + 2; +} + +/** +return the number of bytes occupied by a buffer in CH_UTF16 format +the result includes the null termination +limited by 'n' bytes +**/ +_PUBLIC_ size_t utf16_len_n(const void *src, size_t n) +{ + size_t len; + + for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ; + + if (len+2 <= n) { + len += 2; + } + + return len; +} + + -- cgit