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	grabtitle.c - grabtitle - stupid HTML title grabber
	git clone git://git.codemadness.org/grabtitle
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	grabtitle.c (2167B)
	---
	1 #include <ctype.h>
	2 #include <errno.h>
	3 #include <stdio.h>
	4 #include <stdlib.h>
	5 #include <string.h>
	6 #include <strings.h>
	7
	8 #include "xml.h"
	9
	10 #ifdef __OpenBSD__
	11 #include <unistd.h>
	12 #else
	13 #define pledge(a,b) 0
	14 #endif
	15
	16 static XMLParser parser;
	17 static const char state, endtag;
	18 static int (*getnext)(void);
	19
	20 /* return a space for all data until some case-insensitive string occurs…
	21 is used to parse incorrect HTML/XML that contains unescaped HTML in s…
	22 or style tags. If you see some </script> tag in a CDATA or comment
	23 section then e-mail W3C and tell them the web is too complex. */
	24 static inline int
	25 getnext_ignore(void)
	26 {
	27 int c;
	28
	29 if ((c = getnext()) == EOF)
	30 return EOF;
	31
	32 if (tolower(c) == tolower((unsigned char)*state)) {
	33 state++;
	34 if (*state == '\0') {
	35 parser.getnext = getnext; /* restore */
	36 return c;
	37 }
	38 } else {
	39 state = endtag;
	40 }
	41
	42 return ' ';
	43 }
	44
	45 static void
	46 xmltagend(XMLParser p, const char t, size_t tl, int isshort)
	47 {
	48 putchar('\n');
	49 exit(0);
	50 }
	51
	52 /* data and CDATA */
	53 static void
	54 xmldata(XMLParser p, const char d, size_t dl)
	55 {
	56 size_t i;
	57
	58 for (i = 0; *d && i < dl; i++, d++) {
	59 if (iscntrl((unsigned char)*d))
	60 putchar(' ');
	61 else
	62 putchar(*d);
	63 }
	64 }
	65
	66 static void
	67 xmldataentity(XMLParser p, const char d, size_t dl)
	68 {
	69 char buf[16];
	70 ssize_t len;
	71
	72 if ((len = xml_entitytostr(d, buf, sizeof(buf))) > 0)
	73 xmldata(p, buf, (size_t)len);
	74 else
	75 xmldata(p, d, dl);
	76 }
	77
	78 static void
	79 xmltagstart(XMLParser p, const char t, size_t tl)
	80 {
	81 if (tl == 6 && !strcasecmp(t, "script")) {
	82 state = endtag = "</script>";
	83 getnext = p->getnext; /* for restore */
	84 p->getnext = getnext_ignore;
	85 } else if (tl == 5 && !strcasecmp(t, "style")) {
	86 state = endtag = "</style>";
	87 getnext = p->getnext; /* for restore */
	88 p->getnext = getnext_ignore;
	89 } else if (tl == 5 && !strcasecmp(t, "title")) {
	90 p->xmltagend = xmltagend;
	91 p->xmlcdata = p->xmldata = xmldata;
	92 p->xmldataentity = xmldataentity;
	93 }
	94 }
	95
	96 int
	97 main(void)
	98 {
	99 if (pledge("stdio", NULL) == -1) {
	100 fprintf(stderr, "pledge: %s\n", strerror(errno));
	101 return 2;
	102 }
	103
	104 parser.xmltagstart = xmltagstart;
	105 parser.getnext = getchar;
	106 xml_parse(&parser);
	107
	108 return 1;
	109 }