Amiga Plus Extra 1997 #1

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Stringer v1.1 © 1996 by Henri Veisterä ====================================== -------------------------------------- 0.0 Document Index ================== 1.0 Overview 1.1 Requirements 1.2 The Story 2.0 Usage 2.1 Command line options 2.2 Output control 2.3 Script file usage 2.4 Preferences 3.0 Example command lines 3.1 Example 1 - Vanilla 3.2 Example 2 - Multiple strings 3.3 Example 3 - A quick scan 3.4 Example 4 - Complex patterns 3.5 Example 5 - Statistics 3.6 Example 6 - Hunt files 3.6 Example 7 - Relative frequencies 4.0 The test section 4.1 Test 1 - Algorithm test 4.2 Test 2 - Multiple small file test 4.3 Test 3 - Multiple large file test 4.4 Test 4 - Multiple string test 4.5 Grande Test Total 4.6 Buffer effeciency graph 5.0 Author and support 6.0 Version history 1.0 Overview ============ 1.1 Requirements ---------------- Stringer needs AmigaOS 2.1 (V37) or later and a minimum of 18 kb's of free mem to operate. Stringer is pure and can be made resident. 1.2 The Story ------------- Yes, yet another Search replacement ... with bells on it. As it happens, I wrote this purely for my own usage and amusement and was surprised to see that there were so many similar utils already out there. This one started its life as a tool for counting strings, mainly very short strings (as in counting the relative frequencies of the alphabets) and it just grew from there. What then makes this one oh, so special ? Why should _YOU_ switch immediately to Stringer ? Well, it's the fastest one around (see the test section). Stringer is a complete in-place replacement for Search emulating _every_ function of Search with identical output (if the user so desires). Stringer specializes in searching for multiple strings. The strings can be of any size, there can be any number of strings, the strings can be read from a file and the strings can be substrings of other strings searched for. If you frequently search for multiple words for whatever reason, no other util comes near in speed and in ease of use. Stringer also has another use than just as a fancy replacement for Search. It displays statistical information on the matched strings. Their match counts, relative space usage and relative frequencies. 2.0 Usage ========= Stringer is run from the CLI with the basic command line looking like this: Stringer SOURCEFILES STRINGS [OPTIONS] Stringer behaves exactly like Search with its default options so you can immediately use it as you did Search before. 2.1 Command line options ------------------------ The full command line usage is as follows: FROM/M/A - Source files to search from SEARCH/A - Strings to search or a file name containing the strings Separate strings with "," in CLI or "<CR>" in a file B=BUFFER/K/N - Work buffer size in kilobytes, defaults to 100 kb C=CASE/S - Case sensitive search N=NONUMS/S - No line numbering V=VERBOSE/S - Show file size and number and size of strings T=SHOWTIME/S - Show elapsed time S=STATS/S - Display search statistics L=NOLINES/S - Don't show lines were a match was found A=ALL/S - Recursively scan the file tree M=MATCHES/S - Show number of matches in current file Q=QUICK/S - Less CR's in the CLI output I=INVERT/S - Show lines that do not match the search criteria P=PATTERN/S - SEARCH is an AmigaDOS pattern F=FILE/S - Hunt for a filename, SEARCH=filename to search for O=ONLY/S - Show only names of files where a match was found BIN/S - Force Stringer to search through binary files. ANSI/S - Highlight matched string in the output MAXHIT/K/N - Give up on a file when MAXHIT matches are found QUIET/S - No output to CLI, only a result code FILECOL/K/N - Color for filenames (a pen number from 0 to n) HITCOL/K/N - Color for a matched string (a pen number from 0 to n) STRFILE/S - Load strings from a file, SEARCH=filename NOPREFS/S - Ignore ENV:Stringer.prefs Yeah, I know, all the stuff in Search, Grep and FlashFind crammed into one and then some more. See the command line examples for more indepth reviews of the options. 2.2 Output control ------------------ Specifying the L=NOLINES option means that you won't get any output on your screen. So, use it only in combination with the M=MATCHES and/or S=STATS options. Using the QUIET option, you won't get any output at all except the error messages. Not even the filenames. Using the O=ONLY option displays only the file names where a match was found so, in effect, this is the same as specifying L=NOLINES, M=MATCHES and Q=QUICK, the output, however, looks different in each case. Use the ANSI option to add some color to your output. You can control the colors with the FILECOL and HITCOL options. Note that if you use the MAXHIT and S=STATS options together the stats won't be correct since the search is aborted when MAXHIT hits are found. MAXHIT is ignored if the option L=NOLINES is on (as it should be on, when you want to see the statistics). While Stringer is running you can abort the search with CTRL-C or you can skip the current file with CTRL-D. 2.3 Script file usage --------------------- Stringer exits with these return codes: 0 = One or more match found 5 = No matches found 20 = A fatal error occured Use Stringer in a script file like this: --- AmigaDOS script file --- Stringer Text.doc PoroJesse QUIET If warn Echo "Didn't find PoroJesse in Text.doc." Else Echo "Found the string PoroJesse in Text.doc !" EndIf --- AmigaDOS script file --- 2.4 Preferences --------------- Stringer reads your preferences from a file called ENV:Stringer.prefs. These options are read in first and thus your command line options are 'added' to these. To temporarily disable the prefs use the command line option NOPREFS. To set your preferences for Stringer do this in CLI: Setenv Stringer ANSI MAXHIT=200 QUICK BUFFER=400 To make these prefs permanent do this: Copy ENV:Stringer.prefs ENVARC:Stringer.prefs 3.0 Example command lines ========================= 3.1 Example 1 ------------- Stringer Include/#? ggi_RastPort ALL Straight forward stuff ... walk through the Include directories searching for the string ggi_RastPort. The search is not case sensitive. This will produce the same output as using the C: command Search. Only a bit faster. 3.2 Example 2 ------------- Stringer #?new#?.txt "STRING ONE,STRING TWO" This example shows the quick way to search for multiple strings from multiple files. The strings include spaces so they are enclosed in quotes. Each string is separated with a comma. If you want to search for a string that includes a comma use two commas in a row : "like I said,, then" 3.3 Example 3 ------------- Stringer dh0:sc/include/#? ALL SEARCH=select B=500 CASE QUICK L M Here we have a quick scan of all the files in this directory and all its child directories. We scan for the word 'select' and the final output will only show the names of the files where the string was found and a count of matches. The name of the file we currently scan is shown but erased by the next name. Like this: --- Stringer Output --- HDisk0:sc/include/intuition/imageclass.h 2 matches HDisk0:sc/include/intuition/intuition.h 22 matches HDisk0:sc/include/intuition/preferences.h 2 matches HDisk0:sc/include/intuition/screens.h 1 matches HDisk0:sc/include/libraries/asl.h 5 matches HDisk0:sc/include/libraries/gadtools.h 4 matches HDisk0:sc/include/libraries/diskfonttag.h 2 matches HDisk0:sc/include/resources/battmembitsamiga.h 2 matches --- Stringer Output --- 3.4 Example 4 ------------- Stringer FROM imageclass.h SEARCH=#?0x0[0-9A-F]L#? PATTERN If you want to search for a complex AmigaDOS pattern use the option PATTERN. Note that there is no sense in using a pattern like SEARCH=(#?keput#?|#?sossut#?) since SEARCH=keput,sossut without the option PATTERN will give the same result and much faster. In this example we look for lines that include an ascii hex number from 0x00L to 0x0FL. Note too that the option CASE aplies here also. And a final note: the pattern is matched against each line in the source file, meaning that a pattern SEARCH=timeout would only match a line that contains nothing but the word timeout. Here's how to make up an AmigaDOS pattern: --- illegally/without permission quoted from the autodocs --- The patterns are fairly extensive, and approximate some of the ability of Unix/grep "regular expression" patterns. Here are the available tokens: ? Matches a single character. # Matches the following expression 0 or more times. (ab|cd) Matches any one of the items seperated by '|'. ~ Negates the following expression. It matches all strings that do not match the expression (aka ~(foo) matches all strings that are not exactly "foo"). [abc] Character class: matches any of the characters in the class. a-z Character range (only within character classes). % Matches 0 characters always (useful in "(foo|bar|%)"). * Synonym for "#?", not available by default in 2.0. Available as an option that can be turned on. "Expression" in the above table means either a single character (ex: "#?"), or an alternation (ex: "#(ab|cd|ef)"), or a character class (ex: "#[a-zA-Z]"). --- illegally/without permission quoted from the autodocs --- 3.5 Example 5 ------------- Stringer Text.txt Strings.txt STRFILE B 300 C V T S L This is a typical statistical output command line. You get output looking quite different from Search. We go through Text.txt looking for the strings in the file Strings.txt. Strings.txt might look like this: String1 Stringer2 Str3 So, it's a text file where the strings are separated with CR's. Internal buffer used is 300 kilobytes in size, matching is case sensitive, you'll see the file size and the number of strings in the file Strings.txt and their collective size. You will see something like this: --- Stringer Output --- Searching 1801657 bytes of data for 3 strings (total 20 bytes) ... String Hits All Relat ' String1' 95889 53 964 ' Stringer2' 2557 5 25 ' Str3' 1001 2 10 ------------------------------------------------------------------- TOTAL: 3 strings 99447 60 1000 Time elapsed: 10 secs (7411549 ticks, 709379 ticks/sec) --- Stringer Output --- This tells you the following: String1 occurs 95889 (Hits column) times in the text, 96.4 (Relat column) percent of the matched strings were String1. String1 makes up 5.3 (All column) percent of the whole text. Stringer2 occurs 2557 times in the text, 2.5 % of the matched strings were String2. Stringer2 takes up approx. 9000 bytes (= 0.005 * 1801657) of the 1801657 bytes in the whole file. Str3 occurs 1001 times in the text, 1.0 % of the matched strings were Str3. The TOTAL line gives the added sums of all the above. The whole operation took 10 seconds. 3.6 Example 6 ------------- Stringer DH0: DH1: DH2: #?.txt ALL FILE Hunt volumes DH0: , DH1: and DH2: for any files that end in letters .txt . This quickly scans the whole directory structure of the three volumes above and displays any files found matching the search criteria. 3.7 Example 7 ------------- Stringer bigtext.txt a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z L S >strout.txt Go through the file bigtext.txt and count all the alphabets in the text. Output statistics to a file called strout.txt. Sort FROM strout.txt TO sorted.txt COLSTART 45 NUMERIC Use the AmigaDOS command Sort and you get output like this (file sorted.txt): --- Stringer Output --- String Hits All Relat ' Z' 1397 0 1 ' Q' 1425 0 1 ' X' 3849 2 3 ' J' 5831 3 5 ' V' 9807 6 8 ' B' 17773 10 16 ' P' 19669 12 17 ' W' 19748 12 17 ' F' 21239 13 19 ' K' 21733 13 19 ' G' 22208 13 20 ' Y' 23191 14 20 ' M' 32917 20 29 ' C' 35719 21 32 ' L' 38968 23 35 ' U' 39221 24 35 ' D' 40567 24 36 ' H' 48059 29 43 ' R' 64312 39 57 ' S' 70609 43 63 ' N' 77408 47 69 ' I' 80250 49 72 ' O' 84288 51 76 ' T' 99484 61 89 ' A' 102745 63 92 ' E' 126617 77 114 ------------------------------------------------------------------- TOTAL: 26 strings 1109034 669 1000 --- Stringer Output --- If the file bigtext.txt was an ascii text file in English you can see from the above the relative frequencies of the alphabets in the English language (or a good approximation of it). There is a 6.9 percent propability that the next letter you see is the letter 'N'. The most common letter is the letter 'E'. 4.0 The test section ==================== I spent a day compiling this stuff, so you better read it through. A quick summary can be found at the end of this section. In all the tests I experimented with different command line options to get the best results, any output was redirected to NIL:. Since some of the utils don't support searching multiple files, multiple directories or multiple strings script files were created for these utils where they were just executed a multiple of times. Test hardware: 68030/28 Mhz, 4 MB/32 bit Mem, Seagate 501 MB SCSI-2 HD, OS3.1 Test software: Search 40.1 by AmigaDOS ssearch 1.4 by Stefan Sticht FSearch 1.2 by Edwin H. Bielawski ZSearch 1.0c by Alessandro Zummo, 030 version used FlashFind 1.2 by Frank Würkner Stringer 1.1 by Henri Veisterä 4.1 Test 1 ---------- Source file is 1801657 bytes of ascii text with variable line lengths. Search one string (strlen = 7 bytes) case sensitive from RamDisk. The string is found two times in the source file. Util Time/s RelSpeed search 92.9 84.5 fsearch 15.3 13.9 ssearch 11.1 10.1 zsearch 3.7 3.4 flashfind 1.1 1.0 stringer 1.1 1.0 This is a test of just the search algorithms, file access times are minimal here. FlashFind looses by a few hundreths of a second. 4.2 Test 2 ---------- Source files are the Commodore assembler include files 218 files - 16 dirs - 871692 bytes. Searching for one string 11 bytes in size which is found three times in one of the source files. Search is case sensitive from a hard drive. Util Time/s RelSpeed search 99.2 4.3 fsearch 57.1 2.5 zsearch n/a,47.1 2.0 ssearch 41.9 1.8 flashfind 35.9 1.6 stringer 23.0 1.0 Lots of small files (average file size ~4000 bytes) to go through so the importance of the search algorithm is less here, a large portion of the time is spent loading the files. Stringer wins through efficient multiple file implementation. ZSearch can't search multiple files so the time here is from a script file created for this test. 4.3 Test 3 ---------- Commodore AutoDocs 30 files - 1768252 bytes. Searching for one string (7 bytes). String is found 47 times in the source files. Search is case sensitive from a hard drive. Util Time/s RelSpeed search 159.8 24.2 ssearch 63.4 9.6 fsearch 63.0 9.5 flashfind 52.7 8.0 zsearch n/a,14.4 2.2 stringer 6.6 1.0 Stringer really shines through here. Easily the fastest 8-P. 4.4 Test 4 - The really unfair test =) -------------------------------------- Commodore AutoDocs 30 files - 1768252 bytes. Searching for three strings (20 bytes). Strings are found 375 times in the source files. Search is not case sensitive and from a hard drive. search 554.2 38.5 fsearch n/a,202.6 14.1 ssearch n/a,195.7 13.6 flashfind 353.1,159.1 11.0 zsearch n/a,43.9 3.0 stringer 14.4 1.0 As you can see, this is why I made Stringer in the first place so it should show here ... and it does :-! Only Stringer, FlashFind and Search have the capability to search for multiple strings. All the results after the commas are from script files created for this test. 4.5 Grande Test Total --------------------- Test1 Test2 Test3 Test4 Total Time/s Rel Time/s Rel Time/s Rel Time/s Rel Time/s Rel search 92.9 84.5 99.2 4.3 159.8 24.2 554.2 38.5 906.1 20.1 fsearch 15.3 13.9 57.1 2.5 63.0 9.6 202.6+ 14.1 338.0 7.5 ssearch 11.1 10.1 41.9 2.0 63.4 9.5 195.7+ 13.6 312.1 6.9 flashfind 1.1 1.0 35.9 1.8 52.7 8.0 159.1+ 11.0 248.8 5.5 zsearch 3.7 3.4 47.1 1.6 14.4+ 2.2 43.9+ 3.0 109.1 2.4 stringer 1.1 1.0* 23.0 1.0* 6.6 1.0* 14.4 1.0* 45.1 1.0 A * marks the best result, a + means that the util didn't support this test and a script file was used instead. So, twice as fast as the nearest contender ... but since zsearch is really limited in its uses I could say 5 to 20 times as fast as the rest ! Most pleasing for me is that Stringer is at its best at just the kind of work I use a string searcher for (tests 3 and 4). Curiosly enough, the only util whose search algorithm is more powerful than Stringers (FlashFind is faster when strlen > 7) fails totally in real world performance. I suspect this has to do with faulty a-sync IO routines. 4.6 Buffer effeciency graph --------------------------- No test section would be complete without a beatiful graph. Thus, for your enjoyment: the following graph represents the time spent searching for one string from a 1759 kb source file with varying buffer sizes. 1.80 .* 1.75 . · 1.70 * . 1.65 * 1.60 · *·. 1.55 * . *·. 1.50 . .*. * 1.45 ·*··*· . 1.40 * . . 1.35 . 1.30 . . 1.25 . 1.20 * *··*··*··*··*··*·. 1.15 *··* 1.10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 On the y-axis is the elapsed time in seconds and on the x-axis is the buffer size used in 100 kilobytes. The asterisks '*' are measured data points and the points '·' in between were interpolated. From this you can see that after 1200 kb's the usefullness of a greater buffer size is dubious. Note that the low points are situated at 400 kb intervals due to exec.librarys internal optimizations. So, in other words, if you want to use a greater default buffer size use 400, 800 or 1200 kb's. 5.0 Author and support ====================== Stringer was written in 100% Assembler by me, Henri Veisterä. For bug reports, fan/hate-mail or general chit-chat you can contact me through the net via: hveister@snakemail.hut.fi . Stringer is Freeware. Give it away, don't sell it. Latest version will always be posted to AmiNet. 6.0 Version history =================== Version 1.0 - 26-Jun-93 ... Ancient stats shower Version 1.1 - 16-Aug-96 ... First public release