cmhi
/
vcpe
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
vcpe/srcs/libs/misc/sds.c

1463 lines
43 KiB
C
Raw Blame History

/* SDSLib 2.0 -- A C dynamic strings library
*
* Copyright (c) 2006-2015, Salvatore Sanfilippo <antirez at gmail dot com>
* Copyright (c) 2015, Oran Agra
* Copyright (c) 2015, Redis Labs, Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <limits.h>
#include <sds/sds.h>
#include <sds/sdsalloc.h>
hiredisAllocFuncs hiredisAllocFns = {
.mallocFn = malloc,
.callocFn = calloc,
.reallocFn = realloc,
.strdupFn = strdup,
.freeFn = free,
};
/* Override hiredis' allocators with ones supplied by the user */
hiredisAllocFuncs hiredisSetAllocators(hiredisAllocFuncs *override) {
hiredisAllocFuncs orig = hiredisAllocFns;
hiredisAllocFns = *override;
return orig;
}
/* Reset allocators to use libc defaults */
void hiredisResetAllocators(void) {
hiredisAllocFns = (hiredisAllocFuncs) {
.mallocFn = malloc,
.callocFn = calloc,
.reallocFn = realloc,
.strdupFn = strdup,
.freeFn = free,
};
}
static inline int sdsHdrSize(char type) {
switch (type & SDS_TYPE_MASK) {
case SDS_TYPE_5:
return sizeof(struct sdshdr5);
case SDS_TYPE_8:
return sizeof(struct sdshdr8);
case SDS_TYPE_16:
return sizeof(struct sdshdr16);
case SDS_TYPE_32:
return sizeof(struct sdshdr32);
case SDS_TYPE_64:
return sizeof(struct sdshdr64);
}
return 0;
}
static inline char sdsReqType(size_t string_size) {
if (string_size < 32) {
return SDS_TYPE_5;
}
if (string_size < 0xff) {
return SDS_TYPE_8;
}
if (string_size < 0xffff) {
return SDS_TYPE_16;
}
if (string_size < 0xffffffff) {
return SDS_TYPE_32;
}
return SDS_TYPE_64;
}
/* Create a new sds string with the content specified by the 'init' pointer
* and 'initlen'.
* If NULL is used for 'init' the string is initialized with zero bytes.
*
* The string is always null-termined (all the sds strings are, always) so
* even if you create an sds string with:
*
* mystring = sdsnewlen("abc",3);
*
* You can print the string with printf() as there is an implicit \0 at the
* end of the string. However the string is binary safe and can contain
* \0 characters in the middle, as the length is stored in the sds header. */
sds sdsnewlen(const void *init, size_t initlen) {
void *sh;
sds s;
char type = sdsReqType(initlen);
/* Empty strings are usually created in order to append. Use type 8
* since type 5 is not good at this. */
if (type == SDS_TYPE_5 && initlen == 0) {
type = SDS_TYPE_8;
}
int hdrlen = sdsHdrSize(type);
unsigned char *fp; /* flags pointer. */
sh = s_malloc(hdrlen + initlen + 1);
if (sh == NULL) {
return NULL;
}
if (!init) {
memset(sh, 0, hdrlen + initlen + 1);
}
s = (char *)sh + hdrlen;
fp = ((unsigned char *)s) - 1;
switch (type) {
case SDS_TYPE_5: {
*fp = type | (initlen << SDS_TYPE_BITS);
break;
}
case SDS_TYPE_8: {
SDS_HDR_VAR(8, s);
sh->len = initlen;
sh->alloc = initlen;
*fp = type;
break;
}
case SDS_TYPE_16: {
SDS_HDR_VAR(16, s);
sh->len = initlen;
sh->alloc = initlen;
*fp = type;
break;
}
case SDS_TYPE_32: {
SDS_HDR_VAR(32, s);
sh->len = initlen;
sh->alloc = initlen;
*fp = type;
break;
}
case SDS_TYPE_64: {
SDS_HDR_VAR(64, s);
sh->len = initlen;
sh->alloc = initlen;
*fp = type;
break;
}
}
if (initlen && init) {
memcpy(s, init, initlen);
}
s[initlen] = '\0';
return s;
}
/* Create an empty (zero length) sds string. Even in this case the string
* always has an implicit null term. */
sds sdsempty(void) {
return sdsnewlen("", 0);
}
/* Create a new sds string starting from a null terminated C string. */
sds sdsnew(const char *init) {
size_t initlen = (init == NULL) ? 0 : strlen(init);
return sdsnewlen(init, initlen);
}
/* Duplicate an sds string. */
sds sdsdup(const sds s) {
return sdsnewlen(s, sdslen(s));
}
/* Free an sds string. No operation is performed if 's' is NULL. */
void sdsfree(sds s) {
if (s == NULL) {
return;
}
s_free((char *)s - sdsHdrSize(s[-1]));
}
/* Set the sds string length to the length as obtained with strlen(), so
* considering as content only up to the first null term character.
*
* This function is useful when the sds string is hacked manually in some
* way, like in the following example:
*
* s = sdsnew("foobar");
* s[2] = '\0';
* sdsupdatelen(s);
* printf("%d\n", sdslen(s));
*
* The output will be "2", but if we comment out the call to sdsupdatelen()
* the output will be "6" as the string was modified but the logical length
* remains 6 bytes. */
void sdsupdatelen(sds s) {
int reallen = strlen(s);
sdssetlen(s, reallen);
}
/* Modify an sds string in-place to make it empty (zero length).
* However all the existing buffer is not discarded but set as free space
* so that next append operations will not require allocations up to the
* number of bytes previously available. */
void sdsclear(sds s) {
sdssetlen(s, 0);
s[0] = '\0';
}
/* Enlarge the free space at the end of the sds string so that the caller
* is sure that after calling this function can overwrite up to addlen
* bytes after the end of the string, plus one more byte for nul term.
*
* Note: this does not change the *length* of the sds string as returned
* by sdslen(), but only the free buffer space we have. */
sds sdsMakeRoomFor(sds s, size_t addlen) {
void *sh, *newsh;
size_t avail = sdsavail(s);
size_t len, newlen;
char type, oldtype = s[-1] & SDS_TYPE_MASK;
int hdrlen;
/* Return ASAP if there is enough space left. */
if (avail >= addlen) {
return s;
}
len = sdslen(s);
sh = (char *)s - sdsHdrSize(oldtype);
newlen = (len + addlen);
if (newlen < SDS_MAX_PREALLOC) {
newlen *= 2;
} else {
newlen += SDS_MAX_PREALLOC;
}
type = sdsReqType(newlen);
/* Don't use type 5: the user is appending to the string and type 5 is
* not able to remember empty space, so sdsMakeRoomFor() must be called
* at every appending operation. */
if (type == SDS_TYPE_5) {
type = SDS_TYPE_8;
}
hdrlen = sdsHdrSize(type);
if (oldtype == type) {
newsh = s_realloc(sh, hdrlen + newlen + 1);
if (newsh == NULL) {
return NULL;
}
s = (char *)newsh + hdrlen;
} else {
/* Since the header size changes, need to move the string forward,
* and can't use realloc */
newsh = s_malloc(hdrlen + newlen + 1);
if (newsh == NULL) {
return NULL;
}
memcpy((char *)newsh + hdrlen, s, len + 1);
s_free(sh);
s = (char *)newsh + hdrlen;
s[-1] = type;
sdssetlen(s, len);
}
sdssetalloc(s, newlen);
return s;
}
/* Reallocate the sds string so that it has no free space at the end. The
* contained string remains not altered, but next concatenation operations
* will require a reallocation.
*
* After the call, the passed sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call. */
sds sdsRemoveFreeSpace(sds s) {
void *sh, *newsh;
char type, oldtype = s[-1] & SDS_TYPE_MASK;
int hdrlen;
size_t len = sdslen(s);
sh = (char *)s - sdsHdrSize(oldtype);
type = sdsReqType(len);
hdrlen = sdsHdrSize(type);
if (oldtype == type) {
newsh = s_realloc(sh, hdrlen + len + 1);
if (newsh == NULL) {
return NULL;
}
s = (char *)newsh + hdrlen;
} else {
newsh = s_malloc(hdrlen + len + 1);
if (newsh == NULL) {
return NULL;
}
memcpy((char *)newsh + hdrlen, s, len + 1);
s_free(sh);
s = (char *)newsh + hdrlen;
s[-1] = type;
sdssetlen(s, len);
}
sdssetalloc(s, len);
return s;
}
/* Return the total size of the allocation of the specifed sds string,
* including:
* 1) The sds header before the pointer.
* 2) The string.
* 3) The free buffer at the end if any.
* 4) The implicit null term.
*/
size_t sdsAllocSize(sds s) {
size_t alloc = sdsalloc(s);
return sdsHdrSize(s[-1]) + alloc + 1;
}
/* Return the pointer of the actual SDS allocation (normally SDS strings
* are referenced by the start of the string buffer). */
void *sdsAllocPtr(sds s) {
return (void *)(s - sdsHdrSize(s[-1]));
}
/* Increment the sds length and decrements the left free space at the
* end of the string according to 'incr'. Also set the null term
* in the new end of the string.
*
* This function is used in order to fix the string length after the
* user calls sdsMakeRoomFor(), writes something after the end of
* the current string, and finally needs to set the new length.
*
* Note: it is possible to use a negative increment in order to
* right-trim the string.
*
* Usage example:
*
* Using sdsIncrLen() and sdsMakeRoomFor() it is possible to mount the
* following schema, to cat bytes coming from the kernel to the end of an
* sds string without copying into an intermediate buffer:
*
* oldlen = sdslen(s);
* s = sdsMakeRoomFor(s, BUFFER_SIZE);
* nread = read(fd, s+oldlen, BUFFER_SIZE);
* ... check for nread <= 0 and handle it ...
* sdsIncrLen(s, nread);
*/
void sdsIncrLen(sds s, int incr) {
unsigned char flags = s[-1];
size_t len;
switch (flags & SDS_TYPE_MASK) {
case SDS_TYPE_5: {
unsigned char *fp = ((unsigned char *)s) - 1;
unsigned char oldlen = SDS_TYPE_5_LEN(flags);
assert((incr > 0 && oldlen + incr < 32) || (incr < 0 && oldlen >= (unsigned int)(-incr)));
*fp = SDS_TYPE_5 | ((oldlen + incr) << SDS_TYPE_BITS);
len = oldlen + incr;
break;
}
case SDS_TYPE_8: {
SDS_HDR_VAR(8, s);
assert((incr >= 0 && sh->alloc - sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr)));
len = (sh->len += incr);
break;
}
case SDS_TYPE_16: {
SDS_HDR_VAR(16, s);
assert((incr >= 0 && sh->alloc - sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr)));
len = (sh->len += incr);
break;
}
case SDS_TYPE_32: {
SDS_HDR_VAR(32, s);
assert((incr >= 0 && sh->alloc - sh->len >= (unsigned int)incr)
|| (incr < 0 && sh->len >= (unsigned int)(-incr)));
len = (sh->len += incr);
break;
}
case SDS_TYPE_64: {
SDS_HDR_VAR(64, s);
assert((incr >= 0 && sh->alloc - sh->len >= (uint64_t)incr) || (incr < 0 && sh->len >= (uint64_t)(-incr)));
len = (sh->len += incr);
break;
}
default:
len = 0; /* Just to avoid compilation warnings. */
}
s[len] = '\0';
}
/* Grow the sds to have the specified length. Bytes that were not part of
* the original length of the sds will be set to zero.
*
* if the specified length is smaller than the current length, no operation
* is performed. */
sds sdsgrowzero(sds s, size_t len) {
size_t curlen = sdslen(s);
if (len <= curlen) {
return s;
}
s = sdsMakeRoomFor(s, len - curlen);
if (s == NULL) {
return NULL;
}
/* Make sure added region doesn't contain garbage */
memset(s + curlen, 0, (len - curlen + 1)); /* also set trailing \0 byte */
sdssetlen(s, len);
return s;
}
/* Append the specified binary-safe string pointed by 't' of 'len' bytes to the
* end of the specified sds string 's'.
*
* After the call, the passed sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call. */
sds sdscatlen(sds s, const void *t, size_t len) {
size_t curlen = sdslen(s);
s = sdsMakeRoomFor(s, len);
if (s == NULL) {
return NULL;
}
memcpy(s + curlen, t, len);
sdssetlen(s, curlen + len);
s[curlen + len] = '\0';
return s;
}
/* Append the specified null termianted C string to the sds string 's'.
*
* After the call, the passed sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call. */
sds sdscat(sds s, const char *t) {
return sdscatlen(s, t, strlen(t));
}
/* Append the specified sds 't' to the existing sds 's'.
*
* After the call, the modified sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call. */
sds sdscatsds(sds s, const sds t) {
return sdscatlen(s, t, sdslen(t));
}
/* Destructively modify the sds string 's' to hold the specified binary
* safe string pointed by 't' of length 'len' bytes. */
sds sdscpylen(sds s, const char *t, size_t len) {
if (sdsalloc(s) < len) {
s = sdsMakeRoomFor(s, len - sdslen(s));
if (s == NULL) {
return NULL;
}
}
memcpy(s, t, len);
s[len] = '\0';
sdssetlen(s, len);
return s;
}
/* Like sdscpylen() but 't' must be a null-termined string so that the length
* of the string is obtained with strlen(). */
sds sdscpy(sds s, const char *t) {
return sdscpylen(s, t, strlen(t));
}
/* Helper for sdscatlonglong() doing the actual number -> string
* conversion. 's' must point to a string with room for at least
* SDS_LLSTR_SIZE bytes.
*
* The function returns the length of the null-terminated string
* representation stored at 's'. */
#define SDS_LLSTR_SIZE 21
int sdsll2str(char *s, long long value) {
char *p, aux;
unsigned long long v;
size_t l;
/* Generate the string representation, this method produces
* an reversed string. */
v = (value < 0) ? -value : value;
p = s;
do {
*p++ = '0' + (v % 10);
v /= 10;
} while (v);
if (value < 0) {
*p++ = '-';
}
/* Compute length and add null term. */
l = p - s;
*p = '\0';
/* Reverse the string. */
p--;
while (s < p) {
aux = *s;
*s = *p;
*p = aux;
s++;
p--;
}
return l;
}
/* Identical sdsll2str(), but for unsigned long long type. */
int sdsull2str(char *s, unsigned long long v) {
char *p, aux;
size_t l;
/* Generate the string representation, this method produces
* an reversed string. */
p = s;
do {
*p++ = '0' + (v % 10);
v /= 10;
} while (v);
/* Compute length and add null term. */
l = p - s;
*p = '\0';
/* Reverse the string. */
p--;
while (s < p) {
aux = *s;
*s = *p;
*p = aux;
s++;
p--;
}
return l;
}
/* Create an sds string from a long long value. It is much faster than:
*
* sdscatprintf(sdsempty(),"%lld\n", value);
*/
sds sdsfromlonglong(long long value) {
char buf[SDS_LLSTR_SIZE];
int len = sdsll2str(buf, value);
return sdsnewlen(buf, len);
}
/* Like sdscatprintf() but gets va_list instead of being variadic. */
sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
va_list cpy;
char staticbuf[1024], *buf = staticbuf, *t;
size_t buflen = strlen(fmt) * 2;
/* We try to start using a static buffer for speed.
* If not possible we revert to heap allocation. */
if (buflen > sizeof(staticbuf)) {
buf = s_malloc(buflen);
if (buf == NULL) {
return NULL;
}
} else {
buflen = sizeof(staticbuf);
}
/* Try with buffers two times bigger every time we fail to
* fit the string in the current buffer size. */
while (1) {
buf[buflen - 2] = '\0';
va_copy(cpy, ap);
vsnprintf(buf, buflen, fmt, cpy);
va_end(cpy);
if (buf[buflen - 2] != '\0') {
if (buf != staticbuf) {
s_free(buf);
}
buflen *= 2;
buf = s_malloc(buflen);
if (buf == NULL) {
return NULL;
}
continue;
}
break;
}
/* Finally concat the obtained string to the SDS string and return it. */
t = sdscat(s, buf);
if (buf != staticbuf) {
s_free(buf);
}
return t;
}
/* Append to the sds string 's' a string obtained using printf-alike format
* specifier.
*
* After the call, the modified sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call.
*
* Example:
*
* s = sdsnew("Sum is: ");
* s = sdscatprintf(s,"%d+%d = %d",a,b,a+b).
*
* Often you need to create a string from scratch with the printf-alike
* format. When this is the need, just use sdsempty() as the target string:
*
* s = sdscatprintf(sdsempty(), "... your format ...", args);
*/
sds sdscatprintf(sds s, const char *fmt, ...) {
va_list ap;
char *t;
va_start(ap, fmt);
t = sdscatvprintf(s, fmt, ap);
va_end(ap);
return t;
}
/* This function is similar to sdscatprintf, but much faster as it does
* not rely on sprintf() family functions implemented by the libc that
* are often very slow. Moreover directly handling the sds string as
* new data is concatenated provides a performance improvement.
*
* However this function only handles an incompatible subset of printf-alike
* format specifiers:
*
* %s - C String
* %S - SDS string
* %i - signed int
* %I - 64 bit signed integer (long long, int64_t)
* %u - unsigned int
* %U - 64 bit unsigned integer (unsigned long long, uint64_t)
* %% - Verbatim "%" character.
*/
sds sdscatfmt(sds s, char const *fmt, ...) {
const char *f = fmt;
int i;
va_list ap;
va_start(ap, fmt);
i = sdslen(s); /* Position of the next byte to write to dest str. */
while (*f) {
char next, *str;
size_t l;
long long num;
unsigned long long unum;
/* Make sure there is always space for at least 1 char. */
if (sdsavail(s) == 0) {
s = sdsMakeRoomFor(s, 1);
if (s == NULL) {
goto fmt_error;
}
}
switch (*f) {
case '%':
next = *(f + 1);
f++;
switch (next) {
case 's':
case 'S':
str = va_arg(ap, char *);
l = (next == 's') ? strlen(str) : sdslen(str);
if (sdsavail(s) < l) {
s = sdsMakeRoomFor(s, l);
if (s == NULL) {
goto fmt_error;
}
}
memcpy(s + i, str, l);
sdsinclen(s, l);
i += l;
break;
case 'i':
case 'I':
if (next == 'i') {
num = va_arg(ap, int);
} else {
num = va_arg(ap, long long);
}
{
char buf[SDS_LLSTR_SIZE];
l = sdsll2str(buf, num);
if (sdsavail(s) < l) {
s = sdsMakeRoomFor(s, l);
if (s == NULL) {
goto fmt_error;
}
}
memcpy(s + i, buf, l);
sdsinclen(s, l);
i += l;
}
break;
case 'u':
case 'U':
if (next == 'u') {
unum = va_arg(ap, unsigned int);
} else {
unum = va_arg(ap, unsigned long long);
}
{
char buf[SDS_LLSTR_SIZE];
l = sdsull2str(buf, unum);
if (sdsavail(s) < l) {
s = sdsMakeRoomFor(s, l);
if (s == NULL) {
goto fmt_error;
}
}
memcpy(s + i, buf, l);
sdsinclen(s, l);
i += l;
}
break;
default: /* Handle %% and generally %<unknown>. */
s[i++] = next;
sdsinclen(s, 1);
break;
}
break;
default:
s[i++] = *f;
sdsinclen(s, 1);
break;
}
f++;
}
va_end(ap);
/* Add null-term */
s[i] = '\0';
return s;
fmt_error:
va_end(ap);
return NULL;
}
/* Remove the part of the string from left and from right composed just of
* contiguous characters found in 'cset', that is a null terminted C string.
*
* After the call, the modified sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call.
*
* Example:
*
* s = sdsnew("AA...AA.a.aa.aHelloWorld :::");
* s = sdstrim(s,"Aa. :");
* printf("%s\n", s);
*
* Output will be just "Hello World".
*/
sds sdstrim(sds s, const char *cset) {
char *start, *end, *sp, *ep;
size_t len;
sp = start = s;
ep = end = s + sdslen(s) - 1;
while (sp <= end && strchr(cset, *sp)) {
sp++;
}
while (ep > sp && strchr(cset, *ep)) {
ep--;
}
len = (sp > ep) ? 0 : ((ep - sp) + 1);
if (s != sp) {
memmove(s, sp, len);
}
s[len] = '\0';
sdssetlen(s, len);
return s;
}
/* Turn the string into a smaller (or equal) string containing only the
* substring specified by the 'start' and 'end' indexes.
*
* start and end can be negative, where -1 means the last character of the
* string, -2 the penultimate character, and so forth.
*
* The interval is inclusive, so the start and end characters will be part
* of the resulting string.
*
* The string is modified in-place.
*
* Return value:
* -1 (error) if sdslen(s) is larger than maximum positive ssize_t value.
* 0 on success.
*
* Example:
*
* s = sdsnew("Hello World");
* sdsrange(s,1,-1); => "ello World"
*/
int sdsrange(sds s, ssize_t start, ssize_t end) {
size_t newlen, len = sdslen(s);
if (len > SSIZE_MAX) {
return -1;
}
if (len == 0) {
return 0;
}
if (start < 0) {
start = len + start;
if (start < 0) {
start = 0;
}
}
if (end < 0) {
end = len + end;
if (end < 0) {
end = 0;
}
}
newlen = (start > end) ? 0 : (end - start) + 1;
if (newlen != 0) {
if (start >= (ssize_t)len) {
newlen = 0;
} else if (end >= (ssize_t)len) {
end = len - 1;
newlen = (start > end) ? 0 : (end - start) + 1;
}
} else {
start = 0;
}
if (start && newlen) {
memmove(s, s + start, newlen);
}
s[newlen] = 0;
sdssetlen(s, newlen);
return 0;
}
/* Apply tolower() to every character of the sds string 's'. */
void sdstolower(sds s) {
int len = sdslen(s), j;
for (j = 0; j < len; j++) {
s[j] = tolower(s[j]);
}
}
/* Apply toupper() to every character of the sds string 's'. */
void sdstoupper(sds s) {
int len = sdslen(s), j;
for (j = 0; j < len; j++) {
s[j] = toupper(s[j]);
}
}
/* Compare two sds strings s1 and s2 with memcmp().
*
* Return value:
*
* positive if s1 > s2.
* negative if s1 < s2.
* 0 if s1 and s2 are exactly the same binary string.
*
* If two strings share exactly the same prefix, but one of the two has
* additional characters, the longer string is considered to be greater than
* the smaller one. */
int sdscmp(const sds s1, const sds s2) {
size_t l1, l2, minlen;
int cmp;
l1 = sdslen(s1);
l2 = sdslen(s2);
minlen = (l1 < l2) ? l1 : l2;
cmp = memcmp(s1, s2, minlen);
if (cmp == 0) {
return l1 - l2;
}
return cmp;
}
/* Split 's' with separator in 'sep'. An array
* of sds strings is returned. *count will be set
* by reference to the number of tokens returned.
*
* On out of memory, zero length string, zero length
* separator, NULL is returned.
*
* Note that 'sep' is able to split a string using
* a multi-character separator. For example
* sdssplit("foo_-_bar","_-_"); will return two
* elements "foo" and "bar".
*
* This version of the function is binary-safe but
* requires length arguments. sdssplit() is just the
* same function but for zero-terminated strings.
*/
sds *sdssplitlen(const char *s, int len, const char *sep, int seplen, int *count) {
int elements = 0, slots = 5, start = 0, j;
sds *tokens;
if (seplen < 1 || len < 0) {
return NULL;
}
tokens = s_malloc(sizeof(sds) * slots);
if (tokens == NULL) {
return NULL;
}
if (len == 0) {
*count = 0;
return tokens;
}
for (j = 0; j < (len - (seplen - 1)); j++) {
/* make sure there is room for the next element and the final one */
if (slots < elements + 2) {
sds *newtokens;
slots *= 2;
newtokens = s_realloc(tokens, sizeof(sds) * slots);
if (newtokens == NULL) {
goto cleanup;
}
tokens = newtokens;
}
/* search the separator */
if ((seplen == 1 && *(s + j) == sep[0]) || (memcmp(s + j, sep, seplen) == 0)) {
tokens[elements] = sdsnewlen(s + start, j - start);
if (tokens[elements] == NULL) {
goto cleanup;
}
elements++;
start = j + seplen;
j = j + seplen - 1; /* skip the separator */
}
}
/* Add the final element. We are sure there is room in the tokens array. */
tokens[elements] = sdsnewlen(s + start, len - start);
if (tokens[elements] == NULL) {
goto cleanup;
}
elements++;
*count = elements;
return tokens;
cleanup : {
int i;
for (i = 0; i < elements; i++) {
sdsfree(tokens[i]);
}
s_free(tokens);
*count = 0;
return NULL;
}
}
/* Free the result returned by sdssplitlen(), or do nothing if 'tokens' is NULL. */
void sdsfreesplitres(sds *tokens, int count) {
if (!tokens) {
return;
}
while (count--) {
sdsfree(tokens[count]);
}
s_free(tokens);
}
/* Append to the sds string "s" an escaped string representation where
* all the non-printable characters (tested with isprint()) are turned into
* escapes in the form "\n\r\a...." or "\x<hex-number>".
*
* After the call, the modified sds string is no longer valid and all the
* references must be substituted with the new pointer returned by the call. */
sds sdscatrepr(sds s, const char *p, size_t len) {
s = sdscatlen(s, "\"", 1);
while (len--) {
switch (*p) {
case '\\':
case '"':
s = sdscatprintf(s, "\\%c", *p);
break;
case '\n':
s = sdscatlen(s, "\\n", 2);
break;
case '\r':
s = sdscatlen(s, "\\r", 2);
break;
case '\t':
s = sdscatlen(s, "\\t", 2);
break;
case '\a':
s = sdscatlen(s, "\\a", 2);
break;
case '\b':
s = sdscatlen(s, "\\b", 2);
break;
default:
if (isprint(*p)) {
s = sdscatprintf(s, "%c", *p);
} else {
s = sdscatprintf(s, "\\x%02x", (unsigned char)*p);
}
break;
}
p++;
}
return sdscatlen(s, "\"", 1);
}
/* Helper function for sdssplitargs() that converts a hex digit into an
* integer from 0 to 15 */
int hex_digit_to_int(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;
default:
return 0;
}
}
/* Split a line into arguments, where every argument can be in the
* following programming-language REPL-alike form:
*
* foo bar "newline are supported\n" and "\xff\x00otherstuff"
*
* The number of arguments is stored into *argc, and an array
* of sds is returned.
*
* The caller should free the resulting array of sds strings with
* sdsfreesplitres().
*
* Note that sdscatrepr() is able to convert back a string into
* a quoted string in the same format sdssplitargs() is able to parse.
*
* The function returns the allocated tokens on success, even when the
* input string is empty, or NULL if the input contains unbalanced
* quotes or closed quotes followed by non space characters
* as in: "foo"bar or "foo'
*/
sds *sdssplitargs(const char *line, int *argc) {
const char *p = line;
char *current = NULL;
char **vector = NULL;
*argc = 0;
while (1) {
/* skip blanks */
while (*p && isspace(*p)) {
p++;
}
if (*p) {
/* get a token */
int inq = 0; /* set to 1 if we are in "quotes" */
int insq = 0; /* set to 1 if we are in 'single quotes' */
int done = 0;
if (current == NULL) {
current = sdsempty();
}
while (!done) {
if (inq) {
if (*p == '\\' && *(p + 1) == 'x' && isxdigit(*(p + 2)) && isxdigit(*(p + 3))) {
unsigned char byte;
byte = (hex_digit_to_int(*(p + 2)) * 16) + hex_digit_to_int(*(p + 3));
current = sdscatlen(current, (char *)&byte, 1);
p += 3;
} else if (*p == '\\' && *(p + 1)) {
char c;
p++;
switch (*p) {
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'b':
c = '\b';
break;
case 'a':
c = '\a';
break;
default:
c = *p;
break;
}
current = sdscatlen(current, &c, 1);
} else if (*p == '"') {
/* closing quote must be followed by a space or
* nothing at all. */
if (*(p + 1) && !isspace(*(p + 1))) {
goto err;
}
done = 1;
} else if (!*p) {
/* unterminated quotes */
goto err;
} else {
current = sdscatlen(current, p, 1);
}
} else if (insq) {
if (*p == '\\' && *(p + 1) == '\'') {
p++;
current = sdscatlen(current, "'", 1);
} else if (*p == '\'') {
/* closing quote must be followed by a space or
* nothing at all. */
if (*(p + 1) && !isspace(*(p + 1))) {
goto err;
}
done = 1;
} else if (!*p) {
/* unterminated quotes */
goto err;
} else {
current = sdscatlen(current, p, 1);
}
} else {
switch (*p) {
case ' ':
case '\n':
case '\r':
case '\t':
case '\0':
done = 1;
break;
case '"':
inq = 1;
break;
case '\'':
insq = 1;
break;
default:
current = sdscatlen(current, p, 1);
break;
}
}
if (*p) {
p++;
}
}
/* add the token to the vector */
{
char **new_vector = s_realloc(vector, ((*argc) + 1) * sizeof(char *));
if (new_vector == NULL) {
s_free(vector);
return NULL;
}
vector = new_vector;
vector[*argc] = current;
(*argc)++;
current = NULL;
}
} else {
/* Even on empty input string return something not NULL. */
if (vector == NULL) {
vector = s_malloc(sizeof(void *));
}
return vector;
}
}
err:
while ((*argc)--) {
sdsfree(vector[*argc]);
}
s_free(vector);
if (current) {
sdsfree(current);
}
*argc = 0;
return NULL;
}
/* Modify the string substituting all the occurrences of the set of
* characters specified in the 'from' string to the corresponding character
* in the 'to' array.
*
* For instance: sdsmapchars(mystring, "ho", "01", 2)
* will have the effect of turning the string "hello" into "0ell1".
*
* The function returns the sds string pointer, that is always the same
* as the input pointer since no resize is needed. */
sds sdsmapchars(sds s, const char *from, const char *to, size_t setlen) {
size_t j, i, l = sdslen(s);
for (j = 0; j < l; j++) {
for (i = 0; i < setlen; i++) {
if (s[j] == from[i]) {
s[j] = to[i];
break;
}
}
}
return s;
}
/* Join an array of C strings using the specified separator (also a C string).
* Returns the result as an sds string. */
sds sdsjoin(char **argv, int argc, char *sep) {
sds join = sdsempty();
int j;
for (j = 0; j < argc; j++) {
join = sdscat(join, argv[j]);
if (j != argc - 1) {
join = sdscat(join, sep);
}
}
return join;
}
/* Like sdsjoin, but joins an array of SDS strings. */
sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen) {
sds join = sdsempty();
int j;
for (j = 0; j < argc; j++) {
join = sdscatsds(join, argv[j]);
if (j != argc - 1) {
join = sdscatlen(join, sep, seplen);
}
}
return join;
}
/* Wrappers to the allocators used by SDS. Note that SDS will actually
* just use the macros defined into sdsalloc.h in order to avoid to pay
* the overhead of function calls. Here we define these wrappers only for
* the programs SDS is linked to, if they want to touch the SDS internals
* even if they use a different allocator. */
void *sds_malloc(size_t size) {
return s_malloc(size);
}
void *sds_realloc(void *ptr, size_t size) {
return s_realloc(ptr, size);
}
void sds_free(void *ptr) {
s_free(ptr);
}
#if defined(SDS_TEST_MAIN)
#include <stdio.h>
#include "testhelp.h"
#include "limits.h"
#define UNUSED(x) (void)(x)
int sdsTest(void) {
{
sds x = sdsnew("foo"), y;
test_cond("Create a string and obtain the length", sdslen(x) == 3 && memcmp(x, "foo\0", 4) == 0)
sdsfree(x);
x = sdsnewlen("foo", 2);
test_cond("Create a string with specified length", sdslen(x) == 2 && memcmp(x, "fo\0", 3) == 0)
x = sdscat(x, "bar");
test_cond("Strings concatenation", sdslen(x) == 5 && memcmp(x, "fobar\0", 6) == 0);
x = sdscpy(x, "a");
test_cond("sdscpy() against an originally longer string", sdslen(x) == 1 && memcmp(x, "a\0", 2) == 0)
x = sdscpy(x, "xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
test_cond("sdscpy() against an originally shorter string",
sdslen(x) == 33 && memcmp(x, "xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0", 33) == 0)
sdsfree(x);
x = sdscatprintf(sdsempty(), "%d", 123);
test_cond("sdscatprintf() seems working in the base case", sdslen(x) == 3 && memcmp(x, "123\0", 4) == 0)
sdsfree(x);
x = sdsnew("--");
x = sdscatfmt(x, "Hello %s World %I,%I--", "Hi!", LLONG_MIN, LLONG_MAX);
test_cond("sdscatfmt() seems working in the base case",
sdslen(x) == 60
&& memcmp(x,
"--Hello Hi! World -9223372036854775808,"
"9223372036854775807--",
60)
== 0) printf("[%s]\n", x);
sdsfree(x);
x = sdsnew("--");
x = sdscatfmt(x, "%u,%U--", UINT_MAX, ULLONG_MAX);
test_cond("sdscatfmt() seems working with unsigned numbers",
sdslen(x) == 35 && memcmp(x, "--4294967295,18446744073709551615--", 35) == 0)
sdsfree(x);
x = sdsnew(" x ");
sdstrim(x, " x");
test_cond("sdstrim() works when all chars match", sdslen(x) == 0)
sdsfree(x);
x = sdsnew(" x ");
sdstrim(x, " ");
test_cond("sdstrim() works when a single char remains", sdslen(x) == 1 && x[0] == 'x')
sdsfree(x);
x = sdsnew("xxciaoyyy");
sdstrim(x, "xy");
test_cond("sdstrim() correctly trims characters", sdslen(x) == 4 && memcmp(x, "ciao\0", 5) == 0)
y = sdsdup(x);
sdsrange(y, 1, 1);
test_cond("sdsrange(...,1,1)", sdslen(y) == 1 && memcmp(y, "i\0", 2) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y, 1, -1);
test_cond("sdsrange(...,1,-1)", sdslen(y) == 3 && memcmp(y, "iao\0", 4) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y, -2, -1);
test_cond("sdsrange(...,-2,-1)", sdslen(y) == 2 && memcmp(y, "ao\0", 3) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y, 2, 1);
test_cond("sdsrange(...,2,1)", sdslen(y) == 0 && memcmp(y, "\0", 1) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y, 1, 100);
test_cond("sdsrange(...,1,100)", sdslen(y) == 3 && memcmp(y, "iao\0", 4) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y, 100, 100);
test_cond("sdsrange(...,100,100)", sdslen(y) == 0 && memcmp(y, "\0", 1) == 0)
sdsfree(y);
sdsfree(x);
x = sdsnew("foo");
y = sdsnew("foa");
test_cond("sdscmp(foo,foa)", sdscmp(x, y) > 0)
sdsfree(y);
sdsfree(x);
x = sdsnew("bar");
y = sdsnew("bar");
test_cond("sdscmp(bar,bar)", sdscmp(x, y) == 0)
sdsfree(y);
sdsfree(x);
x = sdsnew("aar");
y = sdsnew("bar");
test_cond("sdscmp(bar,bar)", sdscmp(x, y) < 0)
sdsfree(y);
sdsfree(x);
x = sdsnewlen("\a\n\0foo\r", 7);
y = sdscatrepr(sdsempty(), x, sdslen(x));
test_cond("sdscatrepr(...data...)", memcmp(y, "\"\\a\\n\\x00foo\\r\"", 15) == 0)
{
unsigned int oldfree;
char *p;
int step = 10, j, i;
sdsfree(x);
sdsfree(y);
x = sdsnew("0");
test_cond("sdsnew() free/len buffers", sdslen(x) == 1 && sdsavail(x) == 0);
/* Run the test a few times in order to hit the first two
* SDS header types. */
for (i = 0; i < 10; i++) {
int oldlen = sdslen(x);
x = sdsMakeRoomFor(x, step);
int type = x[-1] & SDS_TYPE_MASK;
test_cond("sdsMakeRoomFor() len", sdslen(x) == oldlen);
if (type != SDS_TYPE_5) {
test_cond("sdsMakeRoomFor() free", sdsavail(x) >= step);
oldfree = sdsavail(x);
}
p = x + oldlen;
for (j = 0; j < step; j++) {
p[j] = 'A' + j;
}
sdsIncrLen(x, step);
}
test_cond("sdsMakeRoomFor() content",
memcmp("0ABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGH"
"IJABCDEFGHIJ",
x,
101)
== 0);
test_cond("sdsMakeRoomFor() final length", sdslen(x) == 101);
sdsfree(x);
}
}
test_report() return 0;
}
#endif
#ifdef SDS_TEST_MAIN
int main(void) {
return sdsTest();
}
#endif
Reference in New Issue View Git Blame Copy Permalink