GopherProxy

	pubsub_gethub.c - pubsubhubbubblub - pubsubhubbub client implementation
	git clone git://git.codemadness.org/pubsubhubbubblub
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	pubsub_gethub.c (2944B)
	---
	1 #include <err.h>
	2 #include <stdio.h>
	3 #include <strings.h>
	4 #include <unistd.h>
	5
	6 #undef strlcat
	7 size_t strlcat(char , const char , size_t);
	8
	9 #include "xml.h"
	10
	11 #define ISCNTRL(c) ((c) < ' ' \|\| (c) == 0x7f)
	12 #define TOLOWER(c) ((((unsigned)c) - 'A' < 26) ? ((c) \| 32) : (c))
	13
	14 /* string and size */
	15 #define STRP(s) s,sizeof(s)-1
	16
	17 static XMLParser parser;
	18 static int islinktag, ishrefattr, isrelattr;
	19 static char linkhref[4096], linkrel[256];
	20
	21 /* strcasestr() included for portability */
	22 char *
	23 strcasestr(const char h, const char n)
	24 {
	25 size_t i;
	26
	27 if (!n[0])
	28 return (char *)h;
	29
	30 for (; *h; ++h) {
	31 for (i = 0; n[i] && TOLOWER((unsigned char)n[i]) ==
	32 TOLOWER((unsigned char)h[i]); ++i)
	33 ;
	34 if (n[i] == '\0')
	35 return (char *)h;
	36 }
	37
	38 return NULL;
	39 }
	40
	41 static void
	42 printvalue(const char *s)
	43 {
	44 for (; *s; s++)
	45 if (!ISCNTRL((unsigned char)*s))
	46 putchar(*s);
	47 }
	48
	49 static void
	50 xmltagstart(XMLParser p, const char t, size_t tl)
	51 {
	52 islinktag = 0;
	53 char *l;
	54
	55 if (((l = strcasestr(t, ":link")) && !strcasecmp(l, ":link")) \|\|
	56 !strcasecmp(t, "link")) {
	57 islinktag = 1;
	58 linkhref[0] = '\0';
	59 linkrel[0] = '\0';
	60 }
	61 }
	62
	63 static void
	64 xmltagstartparsed(XMLParser p, const char t, size_t tl, int isshort)
	65 {
	66 if (!islinktag)
	67 return;
	68
	69 if (strncasecmp(linkrel, STRP("hub")) &&
	70 strncasecmp(linkrel, STRP("self")))
	71 return;
	72
	73 printvalue(linkhref);
	74 putchar('\t');
	75 printvalue(linkrel);
	76 putchar('\n');
	77 }
	78
	79 static void
	80 xmlattrstart(XMLParser p, const char t, size_t tl, const char *a, size…
	81 {
	82 ishrefattr = isrelattr = 0;
	83
	84 if (!islinktag)
	85 return;
	86
	87 if (!strcasecmp(a, "href")) {
	88 ishrefattr = 1;
	89 linkhref[0] = '\0';
	90 } else if (!strcasecmp(a, "rel")) {
	91 isrelattr = 1;
	92 linkrel[0] = '\0';
	93 }
	94 }
	95
	96 static void
	97 xmlattr(XMLParser p, const char t, size_t tl, const char *n, size_t nl,
	98 const char *v, size_t vl)
	99 {
	100 if (islinktag) {
	101 if (ishrefattr)
	102 strlcat(linkhref, v, sizeof(linkhref));
	103 else if (isrelattr)
	104 strlcat(linkrel, v, sizeof(linkrel));
	105 }
	106 }
	107
	108 static void
	109 xmlattrentity(XMLParser p, const char t, size_t tl, const char *a, siz…
	110 const char *v, size_t vl)
	111 {
	112 char buf[16];
	113 int len;
	114
	115 if (!ishrefattr && !isrelattr)
	116 return;
	117
	118 /* try to translate entity, else just pass as data to
	119 * xmlattr handler. */
	120 if ((len = xml_entitytostr(v, buf, sizeof(buf))) > 0)
	121 xmlattr(p, t, tl, a, al, buf, (size_t)len);
	122 else
	123 xmlattr(p, t, tl, a, al, v, vl);
	124 }
	125
	126 int
	127 main(void)
	128 {
	129 #ifdef __OpenBSD__
	130 if (pledge("stdio", NULL) == -1)
	131 err(1, "pledge");
	132 #endif
	133
	134 parser.xmlattr = xmlattr;
	135 parser.xmlattrentity = xmlattrentity;
	136 parser.xmlattrstart = xmlattrstart;
	137 parser.xmltagstart = xmltagstart;
	138 parser.xmltagstartparsed = xmltagstartparsed;
	139
	140 /* NOTE: getnext is defined in xml.h for inline optimization */
	141 xml_parse(&parser);
	142
	143 if (ferror(stdin))
	144 fputs("read error: <stdin>\n", stderr);;
	145 if (fflush(stdout) \|\| ferror(stdout))
	146 fputs("write error: <stdout>\n", stderr);
	147
	148 return 0;
	149 }