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authorJohannes Löthberg <johannes@kyriasis.com>2015-01-19 16:12:11 +0100
committerJohannes Löthberg <johannes@kyriasis.com>2015-01-19 16:12:11 +0100
commitf87fdaafa1a06575f9ce9e1699a3e1d2fa644694 (patch)
treec1b14cdfa4052eb560cc431fe6866867044eccc3 /src
parent5799f1d884013546c735b6152fac608bd0a2aa72 (diff)
downloadsds-f87fdaafa1a06575f9ce9e1699a3e1d2fa644694.tar.xz
sds.c: Reorder all functions into groups
Diffstat (limited to 'src')
-rw-r--r--src/sds.c850
1 files changed, 434 insertions, 416 deletions
diff --git a/src/sds.c b/src/sds.c
index b0e596e..57a2dc1 100644
--- a/src/sds.c
+++ b/src/sds.c
@@ -34,8 +34,8 @@
#include "sds.h"
-int is_hex_digit(char c);
-int hex_digit_to_int(char c);
+
+/// Initialization
/* Create a new sds string with the content specified by the 'init' pointer
* and 'initlen'.
@@ -67,12 +67,6 @@ sds sdsnewlen(const void *init, size_t initlen) {
return (char*)sh->buf;
}
-/* 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 termined C string. */
sds sdsnew(const char *init) {
size_t initlen = (init == NULL) ? 0 : strlen(init);
@@ -84,33 +78,60 @@ 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; }
- free(sdsheader(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);
}
-/* Set the sds string length to the length as obtained with strlen(), so
- * considering as content only up to the first null term character.
+/* Create an sds string from a long long value. It is much faster than:
*
- * This function is useful when the sds string is hacked manually in some
- * way, like in the following example:
+ * sdscatprintf(sdsempty(), "%lld\n", value);
+ */
+sds sdsfromlonglong(long long value) {
+ char buf[32], *p;
+ unsigned long long v;
+
+ v = (unsigned long long)((value < 0) ? -value : value);
+ p = buf + 31; /* point to the last character */
+ do {
+ *p-- = '0' + (v%10);
+ v /= 10;
+ } while(v);
+ if (value < 0) { *p-- = '-'; }
+ p++;
+ return sdsnewlen(p, (size_t)(32 - (p - buf)));
+}
+
+
+/// Querying
+
+/* Compare two sds strings s1 and s2 with memcmp().
*
- * s = sdsnew("foobar");
- * s[2] = '\0';
- * sdsupdatelen(s);
- * printf("%d\n", sdslen(s));
+ * Return value:
*
- * 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) {
- struct sdshdr *sh = sdsheader(s);
- size_t reallen = strlen(s);
- sh->free += (sh->len - reallen);
- sh->len = reallen;
+ * 1 if s1 > s2.
+ * -1 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 (int)(l1 - l2); }
+ return cmp;
}
+
+/// Modification
+
/* Modify an sds string on-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
@@ -122,94 +143,6 @@ void sdsclear(sds s) {
sh->buf[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) {
- struct sdshdr *sh, *newsh;
- size_t free = sdsavail(s);
- size_t len, newlen;
-
- if (free >= addlen) { return s; }
- len = sdslen(s);
- sh = sdsheader(s);
- newlen = (len + addlen);
- if (newlen < SDS_MAX_PREALLOC) {
- newlen *= 2;
- } else {
- newlen += SDS_MAX_PREALLOC;
- }
- newsh = realloc(sh, sizeof(struct sdshdr) + newlen + 1);
- if (newsh == NULL) { return NULL; }
-
- newsh->free = newlen - len;
- return newsh->buf;
-}
-
-/* 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) {
- struct sdshdr *sh;
-
- sh = sdsheader(s);
- sh = realloc(sh, sizeof(struct sdshdr) + sh->len + 1);
- sh->free = 0;
- return sh->buf;
-}
-
-/* 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) {
- struct sdshdr *sh = sdsheader(s);
-
- return sizeof(*sh) + sh->len + sh->free + 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, size_t incr) {
- struct sdshdr *sh = sdsheader(s);
-
- assert(sh->free >= incr);
- sh->len += incr;
- sh->free -= incr;
- assert(sh->free >= 0);
- s[sh->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.
*
@@ -232,41 +165,6 @@ sds sdsgrowzero(sds s, size_t 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) {
- struct sdshdr *sh;
- size_t curlen = sdslen(s);
-
- s = sdsMakeRoomFor(s, len);
- if (s == NULL) { return NULL; }
- sh = sdsheader(s);
- memcpy(s + curlen, t, len);
- sh->len = curlen + len;
- sh->free = sh->free - 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) {
@@ -292,85 +190,48 @@ sds sdscpy(sds s, const char *t) {
return sdscpylen(s, t, strlen(t));
}
-/* Like sdscatpritf() but gets va_list instead of being variadic. */
-#pragma GCC diagnostic ignored "-Wformat-nonliteral"
-sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
- va_list cpy;
- char *buf, *t;
- size_t buflen = 16;
+/* 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, size_t seplen) {
+ sds join = sdsempty();
- while(1) {
- buf = malloc(buflen);
- if (buf == NULL) { return NULL; }
- buf[buflen - 2] = '\0';
- va_copy(cpy, ap);
- vsnprintf(buf, buflen, fmt, cpy);
- if (buf[buflen - 2] != '\0') {
- free(buf);
- buflen *= 2;
- continue;
- }
- break;
+ for (int j = 0; j < argc; j++) {
+ join = sdscat(join, argv[j]);
+ if (j != argc - 1) { join = sdscatlen(join, sep, seplen); }
}
- t = sdscat(s, buf);
- free(buf);
- return t;
+ return join;
}
-#pragma GCC diagnostic warning "-Wformat-nonliteral"
-/* 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 = sdsempty("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;
+/* Like sdsjoin, but joins an array of SDS strings. */
+sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen) {
+ sds join = sdsempty();
+
+ for (int j = 0; j < argc; j++) {
+ join = sdscatsds(join, argv[j]);
+ if (j != argc - 1) { join = sdscatlen(join, sep, seplen); }
+ }
+ return join;
}
-/* 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:
+/* 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.
*
- * s = sdsnew("AA...AA.a.aa.aHelloWorld :::");
- * s = sdstrim(s, "A. :");
- * printf("%s\n", s);
+ * For instance: sdsmapchars(mystring, "ho", "01", 2)
+ * will have the effect of turning the string "hello" into "0ell1".
*
- * Output will be just "Hello World".
- */
-void sdstrim(sds s, const char *cset) {
- struct sdshdr *sh = sdsheader(s);
- 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 > start && strchr(cset, *ep)) { ep--; }
- len = (size_t)((sp > ep) ? 0 : ((ep - sp) + 1));
- if (sh->buf != sp) { memmove(sh->buf, sp, len); }
- sh->buf[len] = '\0';
- sh->free = sh->free + (sh->len - len);
- sh->len = len;
+ * 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) {
+ for (size_t j = 0; j < sdslen(s); j++) {
+ for (size_t i = 0; i < setlen; i++) {
+ if (s[j] == from[i]) {
+ s[j] = to[i];
+ break;
+ }
+ }
+ }
+ return s;
}
/* Turn the string into a smaller (or equal) string containing only the
@@ -433,182 +294,55 @@ void sdstoupper(sds s) {
}
}
-/* Compare two sds strings s1 and s2 with memcmp().
- *
- * Return value:
- *
- * 1 if s1 > s2.
- * -1 if s1 < s2.
- * 0 if s1 and s2 are exactly the same binary string.
+/* 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.
*
- * 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 (int)(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.
+ * 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.
*
- * On out of memory, zero length string, zero length
- * separator, NULL is returned.
+ * Example:
*
- * 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".
+ * s = sdsnew("AA...AA.a.aa.aHelloWorld :::");
+ * s = sdstrim(s, "A. :");
+ * printf("%s\n", s);
*
- * This version of the function is binary-safe but
- * requires length arguments. sdssplit() is just the
- * same function but for zero-terminated strings.
+ * Output will be just "Hello World".
*/
-sds *sdssplitlen(const char *s, size_t len, const char *sep, size_t seplen, size_t *count) {
- size_t elements = 0, slots = 5, start = 0;
- sds *tokens;
-
- if (seplen < 1) { return NULL; }
-
- tokens = malloc(sizeof(sds)*slots);
- if (tokens == NULL) { return NULL; }
-
- if (len == 0) {
- *count = 0;
- return tokens;
- }
- for (size_t 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 = 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, (size_t)(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, (size_t)(len - start));
- if (tokens[elements] == NULL) { goto cleanup; }
- elements++;
- *count = elements;
- return tokens;
-
-cleanup:
- {
- for (size_t i = 0; i < elements; i++) sdsfree(tokens[i]);
- free(tokens);
- *count = 0;
- return NULL;
- }
-}
+void sdstrim(sds s, const char *cset) {
+ struct sdshdr *sh = sdsheader(s);
+ char *start, *end, *sp, *ep;
+ size_t len;
-/* Free the result returned by sdssplitlen(), or do nothing if 'tokens' is NULL. */
-void sdsfreesplitres(sds *tokens, size_t count) {
- if (!tokens) { return; }
- while(count--) {
- sdsfree(tokens[count]);
- }
- free(tokens);
+ sp = start = s;
+ ep = end = s + sdslen(s) - 1;
+ while(sp <= end && strchr(cset, *sp)) { sp++; }
+ while(ep > start && strchr(cset, *ep)) { ep--; }
+ len = (size_t)((sp > ep) ? 0 : ((ep - sp) + 1));
+ if (sh->buf != sp) { memmove(sh->buf, sp, len); }
+ sh->buf[len] = '\0';
+ sh->free = sh->free + (sh->len - len);
+ sh->len = len;
}
-/* Create an sds string from a long long value. It is much faster than:
+/* Set the sds string length to the length as obtained with strlen(), so
+ * considering as content only up to the first null term character.
*
- * sdscatprintf(sdsempty(), "%lld\n", value);
- */
-sds sdsfromlonglong(long long value) {
- char buf[32], *p;
- unsigned long long v;
-
- v = (unsigned long long)((value < 0) ? -value : value);
- p = buf + 31; /* point to the last character */
- do {
- *p-- = '0' + (v%10);
- v /= 10;
- } while(v);
- if (value < 0) { *p-- = '-'; }
- p++;
- return sdsnewlen(p, (size_t)(32 - (p - buf)));
-}
-
-/* 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>".
+ * This function is useful when the sds string is hacked manually in some
+ * way, like in the following example:
*
- * 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 returns non zero if 'c'
- * is a valid hex digit. */
-int is_hex_digit(char c) {
- return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
- (c >= 'A' && c <= 'F');
-}
-
-/* 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;
- }
+ * 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) {
+ struct sdshdr *sh = sdsheader(s);
+ size_t reallen = strlen(s);
+ sh->free += (sh->len - reallen);
+ sh->len = reallen;
}
/* Split a line into arguments, where every argument can be in the
@@ -741,46 +475,330 @@ err:
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.
+/* 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.
*
- * For instance: sdsmapchars(mystring, "ho", "01", 2)
- * will have the effect of turning the string "hello" into "0ell1".
+ * On out of memory, zero length string, zero length
+ * separator, NULL is returned.
*
- * 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) {
- for (size_t j = 0; j < sdslen(s); j++) {
- for (size_t i = 0; i < setlen; i++) {
- if (s[j] == from[i]) {
- s[j] = to[i];
+ * 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, size_t len, const char *sep, size_t seplen, size_t *count) {
+ size_t elements = 0, slots = 5, start = 0;
+ sds *tokens;
+
+ if (seplen < 1) { return NULL; }
+
+ tokens = malloc(sizeof(sds)*slots);
+ if (tokens == NULL) { return NULL; }
+
+ if (len == 0) {
+ *count = 0;
+ return tokens;
+ }
+ for (size_t 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 = 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, (size_t)(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, (size_t)(len - start));
+ if (tokens[elements] == NULL) { goto cleanup; }
+ elements++;
+ *count = elements;
+ return tokens;
+
+cleanup:
+ {
+ for (size_t i = 0; i < elements; i++) sdsfree(tokens[i]);
+ free(tokens);
+ *count = 0;
+ return NULL;
+ }
+}
+
+// Concatenation
+
+/* 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));
+}
+
+/* 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) {
+ struct sdshdr *sh;
+ size_t curlen = sdslen(s);
+
+ s = sdsMakeRoomFor(s, len);
+ if (s == NULL) { return NULL; }
+ sh = sdsheader(s);
+ memcpy(s + curlen, t, len);
+ sh->len = curlen + len;
+ sh->free = sh->free - len;
+ s[curlen + len] = '\0';
+ return s;
+}
+
+/* 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 s;
+ return sdscatlen(s, "\"", 1);
}
-/* 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, size_t seplen) {
- sds join = sdsempty();
+/* Like sdscatpritf() but gets va_list instead of being variadic. */
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
+sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
+ va_list cpy;
+ char *buf, *t;
+ size_t buflen = 16;
- for (int j = 0; j < argc; j++) {
- join = sdscat(join, argv[j]);
- if (j != argc - 1) { join = sdscatlen(join, sep, seplen); }
+ while(1) {
+ buf = malloc(buflen);
+ if (buf == NULL) { return NULL; }
+ buf[buflen - 2] = '\0';
+ va_copy(cpy, ap);
+ vsnprintf(buf, buflen, fmt, cpy);
+ if (buf[buflen - 2] != '\0') {
+ free(buf);
+ buflen *= 2;
+ continue;
+ }
+ break;
}
- return join;
+ t = sdscat(s, buf);
+ free(buf);
+ return t;
}
+#pragma GCC diagnostic warning "-Wformat-nonliteral"
-/* Like sdsjoin, but joins an array of SDS strings. */
-sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen) {
- sds join = sdsempty();
+/* 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 = sdsempty("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;
+}
- for (int j = 0; j < argc; j++) {
- join = sdscatsds(join, argv[j]);
- if (j != argc - 1) { join = sdscatlen(join, sep, seplen); }
+
+/// Freeing
+
+/* Free an sds string. No operation is performed if 's' is NULL. */
+void sdsfree(sds s) {
+ if (s == NULL) { return; }
+ free(sdsheader(s));
+}
+
+/* Free the result returned by sdssplitlen(), or do nothing if 'tokens' is NULL. */
+void sdsfreesplitres(sds *tokens, size_t count) {
+ if (!tokens) { return; }
+ while(count--) {
+ sdsfree(tokens[count]);
}
- return join;
+ free(tokens);
+}
+
+
+// Low-level functions
+
+/* 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) {
+ struct sdshdr *sh = sdsheader(s);
+
+ return sizeof(*sh) + sh->len + sh->free + 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, size_t incr) {
+ struct sdshdr *sh = sdsheader(s);
+
+ assert(sh->free >= incr);
+ sh->len += incr;
+ sh->free -= incr;
+ assert(sh->free >= 0);
+ s[sh->len] = '\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) {
+ struct sdshdr *sh, *newsh;
+ size_t free = sdsavail(s);
+ size_t len, newlen;
+
+ if (free >= addlen) { return s; }
+ len = sdslen(s);
+ sh = sdsheader(s);
+ newlen = (len + addlen);
+ if (newlen < SDS_MAX_PREALLOC) {
+ newlen *= 2;
+ } else {
+ newlen += SDS_MAX_PREALLOC;
+ }
+ newsh = realloc(sh, sizeof(struct sdshdr) + newlen + 1);
+ if (newsh == NULL) { return NULL; }
+
+ newsh->free = newlen - len;
+ return newsh->buf;
+}
+
+/* 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) {
+ struct sdshdr *sh;
+
+ sh = sdsheader(s);
+ sh = realloc(sh, sizeof(struct sdshdr) + sh->len + 1);
+ sh->free = 0;
+ return sh->buf;
+}
+
+
+/// Low-level helper functions
+
+/* Helper function for sdssplitargs() that returns non zero if 'c'
+ * is a valid hex digit. */
+int is_hex_digit(char c) {
+ return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
+ (c >= 'A' && c <= 'F');
+}
+
+/* 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;
+ }
+}
+