{"id":20871,"date":"2022-11-11T04:48:31","date_gmt":"2022-11-10T23:18:31","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-can-i-traverse-a-string-character-by-character-closed\/"},"modified":"2022-11-11T04:48:31","modified_gmt":"2022-11-10T23:18:31","slug":"solved-how-can-i-traverse-a-string-character-by-character-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-can-i-traverse-a-string-character-by-character-closed\/","title":{"rendered":"[Solved] How can I traverse a string character by character [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-30328393\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"30328393\" data-parentid=\"30326386\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"js-endorsements\" data-for-answer=\"30328393\">\n<\/div>\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>This is how you do it. Next code was made with Visual Studio 2010 C++ console project. First, the assembly part, pay attention to the comments, how to get the string&#8217;s address from stack, how the characters are visited, and the most important part, how the undesired chars are deleted:<\/p>\n<pre><code>.386\n.model flat, C\n.code\n;-------------------------------------------------------\ncheck_alphanum proc\n\n;PRESERVE EBP, ESI.\n  push ebp\n  push esi\n\n  mov  ebp, esp\n  add  ebp, 12          ;GET PARAMETER'S ADDRESS.\n  mov  esi, [ ebp ]     ;ESI POINTS TO ARRAY.\nwhil:\n  mov  al, [ esi ]      ;GET CURRENT CHAR.\n  cmp  al, 0            ;CHECK END OF ARRAY.\n  je   finale           ;IF ( AL == 0 ) END OF STRING.\n\n;CHECK IF CURRENT CHAR IS 0..9-A..Z-a..z.\n  cmp  al, '0'\n  jb   its_invalid      ;IF ( AL &lt;  '0' ) INVALID.\n  cmp  al, '9'\n  jbe  its_valid        ;IF ( AL &lt;= '9' ) VALID.\n  cmp  al, 'A'\n  jb   its_invalid      ;IF ( AL &lt;  'A' ) INVALID.\n  cmp  al, 'Z'\n  jbe  its_valid        ;IF ( AL &lt;= 'Z' ) VALID.\n  cmp  al, 'a'\n  jb   its_invalid      ;IF ( AL &lt;  'a' ) INVALID.\n  cmp  al, 'z'\n  jbe  its_valid        ;IF ( AL &lt;= 'z' ) VALID.\n  jmp  its_invalid      ;INVALID BECAUSE AL &gt; 'z'.\n\nits_valid:\n;NEXT CHAR TO PROCESS.\n  inc  esi\n  jmp  whil\n\nits_invalid:\n;DELETE CURRENT CHAR PUSHING ALL CHARS ONE PLACE TO THE LEFT.\n  mov  edi, esi         ;EDI POINTS TO CURRENT CHAR TO DELETE.\n  mov  ebx, esi         ;EBX ALSO POINTS TO CURRENT CHAR.\n  inc  ebx              ;NOW EBX POINTS TO NEXT CHAR.\nshifting_left:\n  mov  al, [ ebx ]      ;AL = NEXT CHAR.\n  mov  [ edi ], al      ;CURRENT CHAR REPLACED BY NEXT.\n  cmp  al, 0\n  je   end_shifting\n  inc  edi\n  inc  ebx\n  jmp  shifting_left\nend_shifting:\n\n  jmp  whil             ;REPEAT PROCESS FOR NEXT CHAR.\n\nfinale:\n\n;RESTORE EBP, ESI.\n  pop  esi\n  pop  ebp\n\n  ret\ncheck_alphanum endp\n;-------------------------------------------------------\nend\n<\/code><\/pre>\n<p>Now the C++ part. Previous procedure can be called like this, for example, from the &#8220;main&#8221; method:<\/p>\n<pre><code>extern \"C\" void check_alphanum ( char * arr );\n...\nchar arr[] = \"A213457B-3746DFA3-578EC20E-4567DFF2-08A1B3AC-7B125F3A\";\ncheck_alphanum( arr );\n<\/code><\/pre>\n<p>The resulting string is:<\/p>\n<pre><code>\"A213457B3746DFA3578EC20E4567DFF208A1B3AC7B125F3A\"\n<\/code><\/pre>\n<p>Next image shows where is the external assembly file in the project tree:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/jassweb.com\/solved\/wp-content\/uploads\/2022\/11\/Solved-How-can-I-traverse-a-string-character-by-character.jpg\" alt=\"enter image description here\"><\/p>\n<p>All you have to do is add a new file to your project, name it as you want but use the &#8220;.asm&#8221; extension, copy-paste my code in it, and that&#8217;s it, ready to use (or ready to call).<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How can I traverse a string character by character [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] This is how you do it. Next code was made with Visual Studio 2010 C++ console project. First, the assembly part, pay attention to the comments, how to get the string&#8217;s address from stack, how the characters are visited, and the most important part, how the undesired chars are deleted: .386 .model flat, C &#8230; <a title=\"[Solved] How can I traverse a string character by character [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-traverse-a-string-character-by-character-closed\/\" aria-label=\"More on [Solved] How can I traverse a string character by character [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[465,324,362,523],"class_list":["post-20871","post","type-post","status-publish","format-standard","hentry","category-solved","tag-assembly","tag-c","tag-string","tag-x86"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How can I traverse a string character by character [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-can-i-traverse-a-string-character-by-character-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How can I traverse a string character by character [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This is how you do it. 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