Dec 062017
String manipulations in C source.
File C_STRING.ZIP from The Programmer’s Corner in
Category C Source Code
String manipulations in C source.
File Name File Size Zip Size Zip Type
ASCII.H 2758 1123 deflated
BCMP.C 1842 915 deflated
BCOPY.C 1282 679 deflated
BFILL.C 868 451 deflated
BMOVE.C 1184 632 deflated
BZERO.C 760 424 deflated
C2TYPE.C 975 360 deflated
CPMSTRIN.C 5684 1650 deflated
CTYPES.H 8787 1237 deflated
FFS.C 1273 514 deflated
GETOPT.C 1368 534 deflated
GETOPT.DOC 3357 1355 deflated
INT2STR.C 2520 1123 deflated
MAKEFILE.TXT 2972 1235 deflated
MEMCCPY.C 937 503 deflated
MEMCHR.C 992 474 deflated
MEMCMP.C 1276 653 deflated
MEMCPY.C 1048 520 deflated
MEMMOV.C 1111 562 deflated
MEMORY.H 1178 518 deflated
MEMRCHR.C 771 399 deflated
MEMREV.C 909 471 deflated
MEMSET.C 994 480 deflated
MEMTRANS.C 1424 686 deflated
README.TXT 8523 3715 deflated
SHAR.SH 967 310 deflated
STR2INT.C 7050 2617 deflated
STR2MAP.C 2725 1070 deflated
STR2MAP.H 234 179 deflated
STR2PAT.C 1492 741 deflated
STR2PAT.H 237 165 deflated
STR2SET.C 2374 1093 deflated
STR2SET.H 270 196 deflated
STRCAT.C 768 390 deflated
STRCHR.C 922 496 deflated
STRCMP.C 696 419 deflated
STRCPACK.C 1314 585 deflated
STRCPBRK.C 555 325 deflated
STRCPY.C 549 315 deflated
STRCSPN.C 681 393 deflated
STRCTRIM.C 1246 478 deflated
STREND.C 749 413 deflated
STRFIELD.C 2753 1055 deflated
STRFIND.C 1739 781 deflated
STRINGS.H 5733 1889 deflated
STRKEY.C 5350 1517 deflated
STRLEN.C 873 479 deflated
STRMOV.C 603 341 deflated
STRNCAT.C 686 363 deflated
STRNCMP.C 568 303 deflated
STRNCPY.C 730 372 deflated
STRNEND.C 853 443 deflated
STRNLEN.C 746 398 deflated
STRNMOV.C 889 425 deflated
STRNREV.C 1564 729 deflated
STRNRPT.C 956 464 deflated
STRNTRAN.C 1379 618 deflated
STRPACK.C 1345 602 deflated
STRPBRK.C 669 376 deflated
STRPREF.C 884 466 deflated
STRRCHR.C 859 462 deflated
STRREPL.C 2226 883 deflated
STRREV.C 1282 615 deflated
STRRPT.C 712 386 deflated
STRSPN.C 583 330 deflated
STRSUFF.C 816 406 deflated
STRTOK.C 1734 714 deflated
STRTRANS.C 1442 684 deflated
STRTRIM.C 1307 550 deflated
STRXCAT.C 1231 588 deflated
STRXCPY.C 1189 585 deflated
STRXMOV.C 1150 567 deflated
STRXNCAT.C 1668 739 deflated
STRXNCPY.C 1739 778 deflated
STRXNMOV.C 1691 766 deflated
SUBSTR.C 2213 908 deflated

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Contents of the README.TXT file

While this package is for UNIX based C compilers, the source code
is portable to just about any C compiler with little or no changes.
The string functions are found in few C compilers and come in
handy! The makefile.txt contains the make instructions to build
a UNIX .a library. You can use most of the fuctions "stand-alone"
with only the .h files needed for compiles.A lot of work went into
this work by Richard. Compile and enjoy!

>> Also included in this package is cpmstrin.c string library for C.
This package will also run on just about any C compiler.

/*f File : README
Author : Richard A. O'Keefe.
Updated: 1 June 1984.
Purpose: Explain the new strings package.

The UNIX string libraries (described in the string(3) manual page)
differ from UNIX to UNIX (e.g. strtok is not in V7 or 4.1bsd).Worse,
the sources are not in the public domain, so that if there is a string
routine which is nearly what you want but not quite you can't take a
copy and modify it. And of course C programmers on non-UNIX systems
are at the mercy of their supplier.

This package was designed to let me do reasonable things with C's
strings whatever UNIX (V7, PaNiX, UX63, 4.1bsd) I happen to be using.
Everything in the System III manual is here and does just what the S3
manual says it does. There are also lots of new goodies. I'm sorry
about the names, but the routines do have to work on asphyxiated-at-
birth systemswhich truncate identifiers. The convention is that a
routine is called
str [n] [c]
If there is an "n", it means that the function takes an (int) "length"
argument, which bounds the number of characters to be moved orlooked
at. If the function has a "set" argument, a "c" in the name indicates
that the complement of the set is used. Functions or variables whose
names start with _ are support routines which aren't really meant for
general use. I don't know what the "p" is doing in "strpbrk", but it
is there in the S3 manual so it's here too. "istrtok" does not follow
this rule, but with 7 letters what can you do?

I have included new versions of atoi(3) and atol(3) as well. They
use a new primitive str2int, which takes a pair of bounds and a radix,
and does much more thorough checking than the normal atoi and atol do.
The result returned by atoi & atol is valid if and only if errno == 0.
There is also an output conversion routine int2str, with itoa and ltoa
as interface macros. Only after writing int2str did I notice that the
str2int routine has no provision for unsigned numbers.On reflection,
I don't greatly care. I'm afraid that int2str may depend on your "C"
compiler in unexpected ways. Do check the code with -S.

Several of these routines have "asm" inclusions conditional on the
VaxAsm option.These insertions can make the routines which have them
quite a bit faster, but there is a snag. The VAX architects, for some
reason best known to themselves and their therapists, decided that all
"strings" were shorter than 2^16 bytes. Even when the length operands
are in 32-bit registers, only 16 bits count. So the "asm" versions do
not work for long strings. If you can guarantee that all your strings
will be short, define VaxAsm in the makefile, but in general, and when
using other machines, do not define it.

Thanks to someone on the net who saw the first posting of strings,
and sent me a formatted copy of the System V memory(3C) manual page, I
have been able to include versions of these routines.The convention
is that they are called
mem{operation}([dst,] ... , len)
where operation is cpy, cmp, chr, and so on, and len is how many bytes
to move or test. Note that this is different from the strn functions,
str{operation}-- stop when you find a NUL character
strn{operation} -- stop when len is exhausted or you find NUL
mem{operation}-- stop when len is exhausted
b{operation}-- stop when len is exhausted
but the b family has different argument orders or different results or
both. In particular, note that my implementation of bcmp does conform
to the letter of the 4.2bsd manual page, but I decided to make it give
a value I have often wanted, which is not like the value of strcmp. As
the System V manual page is more explicit about the return code memcmp
DOES return a value like strcmp, so you may prefer to use it. BEWARE:
the "c" in the name mem-c-cpy doesn't mean what it does in the System3
names, it's more like mem-chr-cpy.

To use this library, you need the "strings.a" library file and the
"strings.h" header file. The other header files are for compiling the
library itself, though if you are hacking extensions you may find them
useful. General users really shouldn't see them. I've defined a few
macrosI find useful in "strings.h"; if you have no need for "index",
"rindex", "streql", and "beql", just edit themout. On the4.1bsd
system I am using, having all these functions 'extern' does not mean
that they will all be loaded; only the ones you call are. When using
lessersystems you may find it necessary to break strings.h up or you
could get by with just adding "extern" declarations for functions as
you need them. Note that as many of these functions have names
matching "standard C library" names (by design, this is afterall a
replacement/reimplementation of part of that library) you may have to
talk the loader into loading this library first. Again, I've found no
problems on 4.1bsd.

A note on character comparison. The various UNIX manuals come out
and say explicitly that the *cmp and *chr routines use the computer's
"native" character comparison.That is, on a PDP-11, VAX-11, and some
other machines, signed character comparison is used, and the byte 0377
will never be located (use -1). On IBM 370s and many other machines,
unsigned character comparison is used, and the byte -1 can't be found.
(Use 0377.) If you have occasion to use 8-bit byte values in calls to
*chr functions, it would be nice if the package looked after making it
work portably.I thought about that, and decided not to do it, as you
might *want* to write VAX code that didn't find 128, and might rely on
the current effect. However, you should be able to use 8-bit values in
a portable fashion if you ask, and that the package DOES do for you.
There is a macro
which takes the bottom 8 bits of c on a machine with unsigned character
comparison or sign-extends them on a machine with signed comparison. It
is up to you to use this macro in appropriate places. It is up to who-
ever installs the package to make sure that the right definition is put
in and the wrong one commented out.

You may wonder at my failure to provide manual pages for this code.
For the things in V7, 4.?, or SIII, you should be able to use whichever
manual page came with that system, and anything I might write would be
so like it as to raise suspicions of violating AT&T copyrights. In the
sources you will find comments which provide far more documentation for
these routines than AT&T ever provided for their strings stuff, I just
don't happen to have put it in nroff -man form. Had I done so, the *.3
files would have outbulked the .c files!

There is a manual page for the strx family of routines. It was the
work of Tony Hansen, of AT&T Information Systems Lincroft NJ. It is not
clear whether I should distribute this manual page or not, but as these
functions are not likely to documented anywhere else I decided to risk
it. There is no risk in the *code* however. His posting to net.sources
arrived at Edinburgh with just the reason for reposting, and the manual
page. The code is my own work based on his manual page. Indeed, I had
already written strx[n]mov, using different names.

These files are in the public domain. This includes getopt.c, which
is the work of Henry Spencer, University of Toronto Zoology, who says of
it "None of this software is derived from Bell software. I had no access
to the source for Bell's versions at the time I wrote it. This software
is hereby explicitly placed in the public domain. It may be used for
any purpose on any machine by anyone.

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