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added a comment to sdsMakeRoomFor() to make it clear what the function actually does.
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@ -101,6 +101,12 @@ void sdsclear(sds s) {
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sh->buf[0] = '\0';
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}
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/* Enlarge the free space at the end of the sds string so that the caller
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* is sure that after calling this function can overwrite up to addlen
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* bytes after the end of the string, plus one more byte for nul term.
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*
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* Note: this does not change the *size* of the sds string as returned
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* by sdslen(), but only the free buffer space we have. */
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static sds sdsMakeRoomFor(sds s, size_t addlen) {
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struct sdshdr *sh, *newsh;
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size_t free = sdsavail(s);
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