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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:07:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:07:14 +0000
commita175314c3e5827eb193872241446f2f8f5c9d33c (patch)
treecd3d60ca99ae00829c52a6ca79150a5b6e62528b /strings/string.doc
parentInitial commit. (diff)
downloadmariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.tar.xz
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Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+Speciella användbara nya string-rutiner:
+
+ bcmp(s1, s2, len) returns 0 if the "len" bytes starting at "s1" are
+ identical to the "len" bytes starting at "s2", non-zero if they are
+ different.
+
+ bfill(dst, len, fill) moves "len" fill characters to "dst".
+ Thus to set a buffer to 80 spaces, do bfill(buff, 80, ' ').
+
+ bmove(dst, src, len) moves exactly "len" bytes from the source "src"
+ to the destination "dst". It does not check for NUL characters as
+ strncpy() and strnmov() do.
+
+ bmove_upp(dst, src, len) moves exactly "len" bytes from the source
+ "src-len" to the destination "dst-len" counting downwards.
+
+ bzero(dst, len) moves "len" 0 bytes to "dst".
+ Thus to clear a disc buffer to 0s do bzero(buffer, BUFSIZ).
+
+ int2str(dst, radix, val)
+ converts the (long) integer "val" to character form and moves it to
+ the destination string "dst" followed by a terminating NUL. The
+ result is normally a pointer to this NUL character, but if the radix
+ is dud the result will be NullS and nothing will be changed.
+ If radix is -2..-36, val is taken to be SIGNED.
+ If radix is 2.. 36, val is taken to be UNSIGNED.
+ That is, val is signed if and only if radix is. You will normally
+ use radix -10 only through itoa and ltoa, for radix 2, 8, or 16
+ unsigned is what you generally want.
+
+ m_ctype.h
+ A better inplementation of the UNIX ctype(3) library.
+ Notes: global.h should be included before ctype.h
+ - Se efter i filen \c\local\include\m_ctype.h
+ - Används istället för ctype.h för att klara internationella karakterer.
+
+ m_string.h
+ Använd instället för string.h för att supporta snabbare strängfunktioner.
+
+ strintstr(src, from, pat) looks for an instance of pat in src
+ backwards from pos from. pat is not a regex(3) pattern, it is a literal
+ string which must be matched exactly.
+ The result 0 if the pattern was not found else it is the start char of
+ the pattern counted from the beginning of the string.
+
+ strappend(dest, len, fill) appends fill-characters to a string so that
+ the result length == len. If the string is longer than len it's
+ trunked. The des+len character is allways set to NULL.
+
+ strcat(s, t) concatenates t on the end of s. There had better be
+ enough room in the space s points to; strcat has no way to tell.
+ Note that strcat has to search for the end of s, so if you are doing
+ a lot of concatenating it may be better to use strmov, e.g.
+ strmov(strmov(strmov(strmov(s,a),b),c),d)
+ rather than
+ strcat(strcat(strcat(strcpy(s,a),b),c),d).
+ strcat returns the old value of s.
+ - Använd inte strcat, använd strmov (se ovan).
+
+ strcend(s, c) returns a pointer to the first place in s where c
+ occurs, or a pointer to the end-null of s if c does not occur in s.
+
+ strcont(str, set) if str contanies any character in the string set.
+ The result is the position of the first found character in str, or NullS
+ if there isn't anything found.
+
+ strend(s) returns a character pointer to the NUL which ends s. That
+ is, strend(s)-s == strlen(s). This is useful for adding things at
+ the end of strings. It is redundant, because strchr(s,'\0') could
+
+ strfill(dest, len, fill) makes a string of fill-characters. The result
+ string is of length == len. The des+len character is allways set to NULL.
+ strfill() returns pointer to dest+len;
+
+ strfind(src, pat) looks for an instance of pat in src. pat is not a
+ regex(3) pattern, it is a literal string which must be matched exactly.
+ The result is a pointer to the first character of the located instance,
+ or NullS if pat does not occur in src.
+
+ strmake(dst,src,length) moves length characters, or until end, of src to
+ dst and appends a closing NUL to dst.
+ strmake() returns pointer to closing null;
+
+ strmov(dst, src) moves all the characters of src (including the
+ closing NUL) to dst, and returns a pointer to the new closing NUL in
+ dst. The similar UNIX routine strcpy returns the old value of dst,
+ which I have never found useful. strmov(strmov(dst,a),b) moves a//b
+ into dst, which seems useful.
+
+ strnmov(dst,src,length) moves length characters, or until end, of src to
+ dst and appends a closing NUL to dst if src is shorter than length.
+ The result is a pointer to the first NUL in dst, or is dst+n if dst was
+ truncated.
+
+ strrchr(s, c) returns a pointer to the last place in s where c
+ occurs, or NullS if c does not occur in s. This function is called
+ rindex in V7 and 4.?bsd systems.
+ strrchr looks for single characters, not for sets or strings.
+
+ strxmov(dst, src1, ..., srcn, NullS)
+ moves the concatenation of src1,...,srcn to dst, terminates it
+ with a NUL character, and returns a pointer to the terminating NUL.
+ It is just like strmov except that it concatenates multiple sources.
+ Beware: the last argument should be the null character pointer.
+ Take VERY great care not to omit it! Also be careful to use NullS
+ and NOT to use 0, as on some machines 0 is not the same size as a
+ character pointer, or not the same bit pattern as NullS.
+
+ strxnmov(dst, len, src1, ..., srcn, NullS)
+ moves the first len characters of the concatenation of src1,...,srcn
+ to dst. If there aren't that many characters, a NUL character will
+ be added to the end of dst to terminate it properly. This gives the
+ same effect as calling strxcpy(buff, src1, ..., srcn, NullS) with a
+ large enough buffer, and then calling strnmov(dst, buff, len).
+ It is just like strnmov except that it concatenates multiple sources.
+ Beware: the last argument should be the null character pointer.
+ Take VERY great care not to omit it! Also be careful to use NullS
+ and NOT to use 0, as on some machines 0 is not the same size as a
+ character pointer, or not the same bit pattern as NullS.
+
+ Note: strxnmov is like strnmov in that it always moves EXACTLY len
+ characters; dst will be padded on the right with NUL characters as
+ needed. strxncpy does the same. strxncat, like strncat, does NOT.
+
+
+I mysys:
+
+ stripp_sp(string str)
+ Strips end-space from string and returns new length.
+
+ strlength(const string str)
+ Return length of string with end-space:s not counted.
+
+ void caseup _A((string str,uint length));
+ void casedn _A((string str,uint length));
+ void caseup_str _A((string str));
+ void casedn_str _A((string str));
+ Converts strings or part of string to upper or lower-case.
+
+ void case_sort _A((string str,uint length));
+ Converts string to a string with can be compared with strcmp() to
+ get strings in rigth order.
+
+ string strcfind(str,search)
+ find string in another with no case_sensivity
+
+ my_strcasecmp(s,t)
+ Compare strings without regarding to case
+ - For many strings it quicker to forst use case_sort on all strings and
+ then compare them with strcmp().