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serval-dna/str.c
Andrew Bettison a95ef79139 Use sid_t everywhere 
Remove stowSid() at last

Change API of tohex() and strbuf_tohex(), to pass string length instead of
binary byte count.  This allows odd numbers of hex digits to be produced.

Remove alloca_tohex_sid(); replace with alloca_tohex_sid_t()

New alloca_tohex_sid_t_trunc() macro
2013-10-09 18:54:21 +10:30

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/*
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.
*/
#define __STR_INLINE
#include "str.h"
#include "strbuf_helpers.h"
#include "constants.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <limits.h>
const char hexdigit[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
char *tohex(char *dstHex, size_t dstStrLen, const unsigned char *srcBinary)
{
char *p;
size_t i;
for (p = dstHex, i = 0; i < dstStrLen; ++i)
*p++ = (i & 1) ? hexdigit[*srcBinary++ & 0xf] : hexdigit[*srcBinary >> 4];
*p = '\0';
return dstHex;
}
/* Convert nbinary*2 ASCII hex characters [0-9A-Fa-f] to nbinary bytes of data. Can be used to
* perform the conversion in-place, eg, fromhex(buf, (char*)buf, n); Returns -1 if a non-hex-digit
* character is encountered, otherwise returns the number of binary bytes produced (= nbinary).
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
size_t fromhex(unsigned char *dstBinary, const char *srcHex, size_t nbinary)
{
if (strn_fromhex(dstBinary, nbinary, srcHex, NULL) == nbinary)
return nbinary;
return -1;
}
/* Convert nbinary*2 ASCII hex characters [0-9A-Fa-f] followed by a nul '\0' character to nbinary
* bytes of data. Can be used to perform the conversion in-place, eg, fromhex(buf, (char*)buf, n);
* Returns -1 if a non-hex-digit character is encountered or the character immediately following the
* last hex digit is not a nul, otherwise returns zero.
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int fromhexstr(unsigned char *dstBinary, const char *srcHex, size_t nbinary)
{
const char *p;
if (strn_fromhex(dstBinary, nbinary, srcHex, &p) == nbinary && *p == '\0')
return 0;
return -1;
}
/* Decode pairs of ASCII hex characters [0-9A-Fa-f] into binary data with an optional upper limit on
* the number of binary bytes produced (destination buffer size). Returns the number of binary
* bytes decoded. If 'afterHex' is not NULL, then sets *afterHex to point to the source character
* immediately following the last hex digit consumed.
*
* Can be used to perform a conversion in-place, eg:
*
* strn_fromhex((unsigned char *)buf, n, (const char *)buf, NULL);
*
* Can also be used to count hex digits without converting, eg:
*
* strn_fromhex(NULL, -1, buf, NULL);
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
size_t strn_fromhex(unsigned char *dstBinary, ssize_t dstlen, const char *srcHex, const char **afterHex)
{
unsigned char *dstorig = dstBinary;
unsigned char *dstend = dstBinary + dstlen;
while (dstlen == -1 || dstBinary < dstend) {
int high = hexvalue(srcHex[0]);
if (high == -1)
break;
int low = hexvalue(srcHex[1]);
if (low == -1)
break;
if (dstorig != NULL)
*dstBinary = (high << 4) + low;
++dstBinary;
srcHex += 2;
}
if (afterHex)
*afterHex = srcHex;
return dstBinary - dstorig;
}
/* Does this whole buffer contain the same value? */
int is_all_matching(const unsigned char *ptr, size_t len, unsigned char value)
{
while (len--)
if (*ptr++ != value)
return 0;
return 1;
}
char *str_toupper_inplace(char *str)
{
register char *s;
for (s = str; *s; ++s)
*s = toupper(*s);
return str;
}
const char *strnchr(const char *s, size_t n, char c)
{
for (; n; --n, ++s) {
if (*s == c)
return s;
if (!*s)
break;
}
return NULL;
}
int str_startswith(const char *str, const char *substring, const char **afterp)
{
while (*substring && *substring == *str)
++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strn_startswith(const char *str, size_t len, const char *substring, const char **afterp)
{
while (len && *substring && *substring == *str)
--len, ++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strcase_startswith(const char *str, const char *substring, const char **afterp)
{
while (*substring && *str && toupper(*substring) == toupper(*str))
++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strncase_startswith(const char *str, size_t len, const char *substring, const char **afterp)
{
while (len && *substring && toupper(*substring) == toupper(*str))
--len, ++substring, ++str;
if (*substring)
return 0;
if (afterp)
*afterp = str;
return 1;
}
int strn_str_cmp(const char *str1, size_t len1, const char *str2)
{
int r = strncmp(str1, str2, len1);
if (r)
return r;
size_t len2 = strlen(str2);
return len1 < len2 ? -1 : len1 > len2 ? 1 : 0;
}
int strn_str_casecmp(const char *str1, size_t len1, const char *str2)
{
int r = strncasecmp(str1, str2, len1);
if (r)
return r;
size_t len2 = strlen(str2);
return len1 < len2 ? -1 : len1 > len2 ? 1 : 0;
}
int parse_argv(char *cmdline, char delim, char **argv, int max_argv)
{
int argc=0;
if (*cmdline && argc<max_argv){
argv[argc++]=cmdline;
}
// TODO quoted argument handling?
while(*cmdline){
if (*cmdline==delim){
*cmdline=0;
if (cmdline[1] && argc<max_argv)
argv[argc++]=cmdline+1;
}
cmdline++;
}
return argc;
}
/* Like strstr() but doesn't depend on null termination */
char *str_str(char *haystack, const char *needle, int haystack_len)
{
size_t needle_len = strlen(needle);
if (needle_len == 0)
return haystack;
if (haystack_len >= needle_len) {
for (; *haystack && haystack_len >= needle_len; ++haystack, --haystack_len)
if (strncmp(haystack, needle, needle_len) == 0)
return haystack;
}
return NULL;
}
int str_to_int64(const char *str, int base, int64_t *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
long long value = strtoll(str, (char**)&end, base);
if (end == str)
return 0;
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int str_to_uint64(const char *str, int base, uint64_t *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
unsigned long long value = strtoull(str, (char**)&end, base);
if (end == str)
return 0;
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
static struct scale_factor {
char symbol;
uint64_t factor;
}
scale_factors[] = {
{ 'G', 1024LL * 1024LL * 1024LL },
{ 'g', 1000LL * 1000LL * 1000LL },
{ 'M', 1024LL * 1024LL },
{ 'm', 1000LL * 1000LL },
{ 'K', 1024LL },
{ 'k', 1000LL }
};
uint64_t scale_factor(const char *str, const char **afterp)
{
uint64_t factor = 1;
int i;
for (i = 0; i != NELS(scale_factors); ++i)
if (scale_factors[i].symbol == str[0]) {
++str;
factor = scale_factors[i].factor;
break;
}
if (afterp)
*afterp = str;
else if (*str)
factor = 0;
return factor;
}
int str_to_int64_scaled(const char *str, int base, int64_t *result, const char **afterp)
{
int64_t value;
const char *end = str;
if (!str_to_int64(str, base, &value, &end))
return 0;
value *= scale_factor(end, &end);
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int str_to_uint64_scaled(const char *str, int base, uint64_t *result, const char **afterp)
{
uint64_t value;
const char *end = str;
if (!str_to_uint64(str, base, &value, &end))
return 0;
value *= scale_factor(end, &end);
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int uint64_scaled_to_str(char *str, size_t len, uint64_t value)
{
char symbol = '\0';
int i;
for (i = 0; i != NELS(scale_factors); ++i)
if (value % scale_factors[i].factor == 0) {
value /= scale_factors[i].factor;
symbol = scale_factors[i].symbol;
break;
}
strbuf b = strbuf_local(str, len);
strbuf_sprintf(b, "%llu", (unsigned long long) value);
if (symbol)
strbuf_putc(b, symbol);
return strbuf_overrun(b) ? 0 : 1;
}
int str_to_uint64_interval_ms(const char *str, int64_t *result, const char **afterp)
{
const unsigned precision = 1000;
if (isspace(*str))
return 0;
const char *end = str;
unsigned long long value = strtoull(str, (char**)&end, 10) * precision;
if (end == str)
return 0;
if (end[0] == '.' && isdigit(end[1])) {
++end;
unsigned factor;
for (factor = precision / 10; isdigit(*end) && factor; factor /= 10)
value += (*end++ - '0') * factor;
}
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
/* Format a buffer of data as a printable representation, eg: "Abc\x0b\n\0", for display
in log messages.
@author Andrew Bettison <andrew@servalproject.com>
*/
char *toprint(char *dstStr, ssize_t dstBufSiz, const char *srcBuf, size_t srcBytes, const char quotes[2])
{
strbuf b = strbuf_local(dstStr, dstBufSiz);
strbuf_toprint_quoted_len(b, quotes, srcBuf, srcBytes);
return dstStr;
}
/* Compute the length of the string produced by toprint(). If dstStrLen == -1 then returns the
exact number of characters in the printable representation (excluding the terminating nul),
otherwise returns dstStrLen.
@author Andrew Bettison <andrew@servalproject.com>
*/
size_t toprint_len(const char *srcBuf, size_t srcBytes, const char quotes[2])
{
return strbuf_count(strbuf_toprint_quoted_len(strbuf_local(NULL, 0), quotes, srcBuf, srcBytes));
}
/* Format a null-terminated string as a printable representation, eg: `Abc\x0b\n`, for display
in log messages. If the given string pointer is NULL, return the string "NULL" without quotes.
@author Andrew Bettison <andrew@servalproject.com>
*/
char *toprint_str(char *dstStr, ssize_t dstBufSiz, const char *srcStr, const char quotes[2])
{
strbuf b = strbuf_local(dstStr, dstBufSiz);
if (srcStr)
strbuf_toprint_quoted(b, quotes, srcStr);
else
strbuf_puts(b, "NULL");
return dstStr;
}
/* Compute the length of the string produced by toprint_str(), excluding the terminating nul.
@author Andrew Bettison <andrew@servalproject.com>
*/
size_t toprint_str_len(const char *srcStr, const char quotes[2])
{
return srcStr ? strbuf_count(strbuf_toprint_quoted(strbuf_local(NULL, 0), quotes, srcStr)) : 4;
}
size_t strn_fromprint(unsigned char *dst, size_t dstlen, const char *src, char endquote, const char **afterp)
{
unsigned char *const odst = dst;
unsigned char *const edst = dst + dstlen;
while (*src && *src != endquote && dst < edst) {
switch (*src) {
case '\\':
++src;
unsigned char d;
switch (*src) {
case '\0': d = '\\'; break;
case '0': d = '\0'; ++src; break;
case 'n': d = '\n'; ++src; break;
case 'r': d = '\r'; ++src; break;
case 't': d = '\t'; ++src; break;
case 'x':
if (isxdigit(src[1]) && isxdigit(src[2])) {
++src;
fromhex(&d, src, 1);
src += 2;
break;
}
// fall through
default:
d = *src++;
break;
}
*dst++ = d;
break;
default:
*dst++ = *src++;
break;
}
}
if (afterp)
*afterp = src;
return dst - odst;
}
/* Return true if the string resembles a URI.
* Based on RFC-3986 generic syntax, assuming nothing about the hierarchical part.
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int str_is_uri(const char *uri)
{
const char *p;
size_t len;
if (!str_uri_scheme(uri, &p, &len))
return 0;
const char *const q = (p += len + 1);
for (; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
if (p == q)
return 0;
if (*p == '?')
for (++p; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
if (*p == '#')
for (++p; *p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#'; ++p)
;
return !*p;
}
int str_uri_scheme(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
// Scheme is ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
if (!isalpha(*p++))
return 0;
while (is_uri_char_scheme(*p))
++p;
// Scheme is followed by colon ":".
if (*p != ':')
return 0;
if (partp)
*partp = uri;
if (lenp)
*lenp = p - uri;
return 1;
}
int str_uri_hierarchical(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != ':')
++p;
if (*p != ':')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '?' && *p != '#')
++p;
if (p == q)
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_query(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != '?')
++p;
if (*p != '?')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '#')
++p;
if (p == q || (*p && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_fragment(const char *uri, const char **partp, size_t *lenp)
{
const char *p = uri;
while (*p && *p != '#')
++p;
if (*p != '#')
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)))
++p;
if (p == q || *p)
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_hierarchical_authority(const char *hier, const char **partp, size_t *lenp)
{
if (hier[0] != '/' || hier[1] != '/')
return 0;
const char *const q = hier + 2;
const char *p = q;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '/' && *p != '?' && *p != '#')
++p;
if (p == q || (*p && *p != '/' && *p != '?' && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_hierarchical_path(const char *hier, const char **partp, size_t *lenp)
{
if (hier[0] != '/' || hier[1] != '/')
return 0;
const char *p = hier + 2;
while (*p && *p != '/' && *p != '?' && *p != '#')
++p;
if (!*p)
return 0;
const char *const q = ++p;
while (*p && (is_uri_char_unreserved(*p) || is_uri_char_reserved(*p)) && *p != '/' && *p != '?' && *p != '#')
++p;
if (p == q || (*p && *p != '/' && *p != '?' && *p != '#'))
return 0;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_username(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
for (p = auth; *p && *p != '@' && *p != '/' && *p != '?' && *p != '#'; ++p)
;
if (*p != '@')
return 0;
for (p = auth; *p && *p != ':' && *p != '@'; ++p)
;
if (*p != ':')
return 0;
if (partp)
*partp = auth;
if (lenp)
*lenp = p - auth;
return 1;
}
int str_uri_authority_password(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
for (p = auth; *p && *p != '@' && *p != '/' && *p != '?' && *p != '#'; ++p)
;
if (*p != '@')
return 0;
for (p = auth; *p && *p != ':' && *p != '@'; ++p)
;
if (*p != ':')
return 0;
const char *const q = ++p;
for (; *p && *p != '@'; ++p)
;
assert(*p == '@');
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_hostname(const char *auth, const char **partp, size_t *lenp)
{
const char *p;
const char *q = auth;
for (p = auth; *p && *p != '/' && *p != '?' && *p != '#'; ++p)
if (*p == '@')
q = p + 1;
const char *r = p;
while (r > q && isdigit(*--r))
;
if (r < p - 1 && *r == ':')
p = r;
if (partp)
*partp = q;
if (lenp)
*lenp = p - q;
return 1;
}
int str_uri_authority_port(const char *auth, uint16_t *portp)
{
const char *p;
const char *q = auth;
for (p = auth; *p && *p != '/' && *p != '?' && *p != '#'; ++p)
if (*p == '@')
q = p + 1;
const char *r = p;
while (r > q && isdigit(*--r))
;
if (r < p - 1 && *r == ':') {
for (++r; *r == '0'; ++r)
;
unsigned int n;
if (p - r <= 5 && (n = atoi(r)) <= USHRT_MAX) {
*portp = n;
return 1;
}
}
return 0;
}
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