/* Serval string primitives Copyright (C) 2012 Serval Project Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef __STR_H__ #define __STR_H__ #include #include #include #include #include #ifndef __STR_INLINE # if __GNUC__ && !__GNUC_STDC_INLINE__ # define __STR_INLINE extern inline # else # define __STR_INLINE inline # endif #endif /* Return true iff 'len' bytes starting at 'text' are hex digits, upper or lower case. * Does not check the following byte. * * @author Andrew Bettison */ __STR_INLINE int is_xsubstring(const char *text, int len) { while (len--) if (!isxdigit(*text++)) return 0; return 1; } /* Return true iff the nul-terminated string 'text' has length 'len' and consists only of hex * digits, upper or lower case. * * @author Andrew Bettison */ __STR_INLINE int is_xstring(const char *text, int len) { while (len--) if (!isxdigit(*text++)) return 0; return *text == '\0'; } extern const char hexdigit[16]; char *tohex(char *dstHex, size_t dstStrlen, const unsigned char *srcBinary); size_t fromhex(unsigned char *dstBinary, const char *srcHex, size_t nbinary); int fromhexstr(unsigned char *dstBinary, const char *srcHex, size_t nbinary); size_t strn_fromhex(unsigned char *dstBinary, ssize_t dstlen, const char *src, const char **afterp); #define alloca_tohex(buf,bytes) tohex((char *)alloca((bytes)*2+1), (bytes) * 2, (buf)) __STR_INLINE int hexvalue(char c) { switch (c) { case '0': return 0; case '1': return 1; case '2': return 2; case '3': return 3; case '4': return 4; case '5': return 5; case '6': return 6; case '7': return 7; case '8': return 8; case '9': return 9; case 'a': case 'A': return 10; case 'b': case 'B': return 11; case 'c': case 'C': return 12; case 'd': case 'D': return 13; case 'e': case 'E': return 14; case 'f': case 'F': return 15; } return -1; } int is_all_matching(const unsigned char *ptr, size_t len, unsigned char value); char *str_toupper_inplace(char *s); char *toprint(char *dstStr, ssize_t dstBufSiz, const char *srcBuf, size_t srcBytes, const char quotes[2]); char *toprint_str(char *dstStr, ssize_t dstBufSiz, const char *srcStr, const char quotes[2]); size_t toprint_len(const char *srcBuf, size_t srcBytes, const char quotes[2]); size_t toprint_str_len(const char *srcStr, const char quotes[2]); size_t strn_fromprint(unsigned char *dst, size_t dstlen, const char *src, char endquote, const char **afterp); #define alloca_toprint(dstlen,buf,len) toprint((char *)alloca((dstlen) == -1 ? toprint_len((const char *)(buf),(len), "``") + 1 : (dstlen)), (dstlen), (const char *)(buf), (len), "``") #define alloca_str_toprint_quoted(str, quotes) toprint_str((char *)alloca(toprint_str_len((str), (quotes)) + 1), -1, (str), (quotes)) #define alloca_str_toprint(str) alloca_str_toprint_quoted(str, "``") /* Like strchr(3), but only looks for 'c' in the first 'n' characters of 's', stopping at the first * nul char in 's'. * * @author Andrew Bettison */ const char *strnchr(const char *s, size_t n, char c); /* Like strchr(3) and strrchr(3), but returns the index into the string instead of a pointer, or -1 * if the character is not found. The '_dfl' variants take a third argument that gives the default * value to return if the character is not found. * * @author Andrew Bettison */ __STR_INLINE ssize_t str_index_dfl(const char *s, char c, ssize_t dfl) { const char *r = strchr(s, c); return r ? r - s : dfl; } __STR_INLINE ssize_t str_rindex_dfl(const char *s, char c, ssize_t dfl) { const char *r = strrchr(s, c); return r ? r - s : dfl; } __STR_INLINE ssize_t str_index(const char *s, char c) { return str_index_dfl(s, c, -1); } __STR_INLINE ssize_t str_rindex(const char *s, char c) { return str_rindex_dfl(s, c, -1); } /* Check if a given nul-terminated string 'str' starts with a given nul-terminated sub-string. If * so, return 1 and, if afterp is not NULL, set *afterp to point to the character in 'str' * immediately following the substring. Otherwise return 0. * * This function is used to parse HTTP headers and responses, which are typically not * nul-terminated, but are held in a buffer which has an associated length. To avoid this function * running past the end of the buffer, the caller must ensure that the buffer contains a sub-string * that is not part of the sub-string being sought, eg, "\r\n\r\n" as detected by * http_header_complete(). This guarantees that this function will return nonzero before running * past the end of the buffer. * * @author Andrew Bettison */ int str_startswith(const char *str, const char *substring, const char **afterp); /* Check if a given string 'str' of a given length 'len' starts with a given nul-terminated * sub-string. If so, return 1 and, if afterp is not NULL, set *afterp to point to the character * immediately following the substring. Otherwise return 0. * * @author Andrew Bettison */ int strn_startswith(const char *str, size_t len, const char *substring, const char **afterp); /* Case-insensitive form of str_startswith(). * @author Andrew Bettison */ int strcase_startswith(const char *str, const char *substring, const char **afterp); /* Case-insensitive form of strn_startswith(). * @author Andrew Bettison */ int strncase_startswith(const char *str, size_t len, const char *substring, const char **afterp); /* Compare the given string 'str1' of a given length 'len1' with a given nul-terminated string * 'str2'. Equivalent to { str1[len1] = '\0'; return strcmp(str1, str2); } except without modifying * str1[]. * * @author Andrew Bettison */ int strn_str_cmp(const char *str1, size_t len1, const char *str2); /* Compare case-insenstivively the given string 'str1' of a given length 'len1' with a given * nul-terminated string 'str2'. Equivalent to { str1[len1] = '\0'; return strcasecmp(str1, str2); * } except without modifying str1[]. * * @author Andrew Bettison */ int strn_str_casecmp(const char *str1, size_t len1, const char *str2); /* like strstr(3), but doesn't depend on null termination. * * @author Paul Gardner-Stephen * @author Andrew Bettison */ char *str_str(char *haystack, const char *needle, int haystack_len); /* Parse a string as an integer in ASCII radix notation in the given 'base' (eg, base=10 means * decimal). * * Return 1 if a valid integer was parsed, storing the value in *result (unless result is NULL) and * storing a pointer to the immediately succeeding character in *afterp (unless afterp is NULL, in * which case returns 1 only if the immediately succeeding character is a nul '\0'). Returns 0 * otherwise, leaving *result and *afterp unchanged. * * @author Andrew Bettison */ int str_to_int64(const char *str, int base, int64_t *result, const char **afterp); int str_to_uint64(const char *str, int base, uint64_t *result, const char **afterp); /* Parse a string as an integer in ASCII radix notation in the given 'base' (eg, base=10 means * decimal) and scale the result by a factor given by an optional suffix "scaling" character in the * set {kKmMgG}: 'k' = 1e3, 'K' = 1<<10, 'm' = 1e6, 'M' = 1<<20, 'g' = 1e9, 'G' = * 1<<30. * * Return 1 if a valid scaled integer was parsed, storing the value in *result (unless result is * NULL) and storing a pointer to the immediately succeeding character in *afterp (unless afterp is * NULL, in which case returns 1 only if the immediately succeeding character is a nul '\0'). * Returns 0 otherwise, leaving *result and *afterp unchanged. * * NOTE: an argument base > 16 will cause any trailing 'g' or 'G' character to be parsed as part of * the integer, not as a scale suffix. Ditto for base > 20 and 'k' 'K', and base > 22 and 'm' 'M'. * * @author Andrew Bettison */ int str_to_int64_scaled(const char *str, int base, int64_t *result, const char **afterp); int str_to_uint64_scaled(const char *str, int base, uint64_t *result, const char **afterp); uint64_t scale_factor(const char *str, const char **afterp); /* Format a string as a decimal integer in ASCII radix notation with a scale suffix character in the * set {kKmMgG}: 'k' = 1e3, 'K' = 1<<10, 'm' = 1e6, 'M' = 1<<20, 'g' = 1e9, 'G' = * 1<<30 if the * value is an exact multiple. * * Return 1 if the supplied string buffer was large enough to hold the formatted result plus a * terminating nul character, 0 otherwise. * * @author Andrew Bettison */ int uint64_scaled_to_str(char *str, size_t len, uint64_t value); /* Parse a string as a time interval (seconds) in millisecond resolution. Return the number of * milliseconds. Valid strings are all unsigned ASCII decimal numbers with up to three digits after * the decimal point. * * Return 1 if a valid interval was parsed, storing the number of milliseconds in *result (unless * result is NULL) and storing a pointer to the immediately succeeding character in *afterp (unless * afterp is NULL, in which case returns 1 only if the immediately succeeding character is a nul * '\0'). Returns 0 otherwise, leaving *result and *afterp unchanged. * * @author Andrew Bettison */ int str_to_uint64_interval_ms(const char *str, int64_t *result, const char **afterp); /* Return true if the string resembles a nul-terminated URI. * Based on RFC-3986 generic syntax, assuming nothing about the hierarchical part. * * uri := scheme ":" hierarchical [ "?" query ] [ "#" fragment ] * * @author Andrew Bettison */ int str_is_uri(const char *uri); __STR_INLINE int is_uri_char_scheme(char c) { return isalpha(c) || isdigit(c) || c == '+' || c == '-' || c == '.'; } __STR_INLINE int is_uri_char_unreserved(char c) { return isalpha(c) || isdigit(c) || c == '-' || c == '.' || c == '_' || c == '~'; } __STR_INLINE int is_uri_char_reserved(char c) { switch (c) { case ':': case '/': case '?': case '#': case '[': case ']': case '@': case '!': case '$': case '&': case '\'': case '(': case ')': case '*': case '+': case ',': case ';': case '=': return 1; } return 0; } /* Return true if the string resembles a URI scheme without the terminating colon. * Based on RFC-3986 generic syntax. * * @author Andrew Bettison */ __STR_INLINE int str_is_uri_scheme(const char *scheme) { if (!isalpha(*scheme++)) return 0; while (is_uri_char_scheme(*scheme)) ++scheme; return *scheme == '\0'; } /* Pick apart a URI into its basic parts. * * uri := scheme ":" hierarchical [ "?" query ] [ "#" fragment ] * * Based on RFC-3986 generic syntax, assuming nothing about the hierarchical * part. If the respective part is found, sets (*partp) to point to the start * of the part within the supplied 'uri' string, sets (*lenp) to the length of * the part substring and returns 1. Otherwise returns 0. These functions * do not reliably validate that the string in 'uri' is a valid URI; that must * be done by calling str_is_uri(). * * @author Andrew Bettison */ int str_uri_scheme(const char *uri, const char **partp, size_t *lenp); int str_uri_hierarchical(const char *uri, const char **partp, size_t *lenp); int str_uri_query(const char *uri, const char **partp, size_t *lenp); int str_uri_fragment(const char *uri, const char **partp, size_t *lenp); /* Pick apart a URI hierarchical part into its basic parts. * * hierarchical := "//" authority [ "/" path ] * * If the respective part is found, sets (*partp) to point to the start of the * part within the supplied 'uri' string, sets (*lenp) to the length of the * part substring and returns 1. Otherwise returns 0. * * These functions may be called directly on the part returned by * str_uri_hierarchical(), even though it is not nul-terminated, because they * treat "?" and "#" as equally valid terminators. * * @author Andrew Bettison */ int str_uri_hierarchical_authority(const char *hier, const char **partp, size_t *lenp); int str_uri_hierarchical_path(const char *hier, const char **partp, size_t *lenp); /* Pick apart a URI authority into its basic parts. * * authority := [ username ":" password "@" ] hostname [ ":" port ] * * If the respective part is found, sets (*partp) to point to the start of the * part within the supplied 'uri' string, sets (*lenp) to the length of the * part substring and returns 1. Otherwise returns 0. * * These functions may be called directly on the part returned by * str_uri_hierarchical_authority(), even though it is not nul-terminated, * because they treat "/", "?" and "#" as equally valid terminators. * * @author Andrew Bettison */ int str_uri_authority_username(const char *auth, const char **partp, size_t *lenp); int str_uri_authority_password(const char *auth, const char **partp, size_t *lenp); int str_uri_authority_hostname(const char *auth, const char **partp, size_t *lenp); int str_uri_authority_port(const char *auth, uint16_t *portp); int parse_argv(char *cmdline, char delim, char **argv, int max_argv); #endif