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	sfeed_web.c - sfeed - RSS and Atom parser
	git clone git://git.codemadness.org/sfeed
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	---
	sfeed_web.c (3105B)
	---
	1 #include <stdio.h>
	2 #include <strings.h>
	3
	4 #include "util.h"
	5 #include "xml.h"
	6
	7 /* string and size */
	8 #define STRP(s) s,sizeof(s)-1
	9
	10 static XMLParser parser;
	11 static int isbasetag, islinktag, ishrefattr, istypeattr;
	12 static char linkhref[4096], linktype[256], basehref[4096];
	13
	14 static void
	15 printvalue(const char *s)
	16 {
	17 for (; *s; s++)
	18 if (!ISCNTRL((unsigned char)*s))
	19 putchar(*s);
	20 }
	21
	22 static void
	23 xmltagstart(XMLParser p, const char t, size_t tl)
	24 {
	25 isbasetag = islinktag = 0;
	26
	27 if (!strcasecmp(t, "base")) {
	28 isbasetag = 1;
	29 } else if (!strcasecmp(t, "link")) {
	30 islinktag = 1;
	31 linkhref[0] = '\0';
	32 linktype[0] = '\0';
	33 }
	34 }
	35
	36 static void
	37 xmltagstartparsed(XMLParser p, const char t, size_t tl, int isshort)
	38 {
	39 struct uri baseuri, linkuri, u;
	40 char buf[4096];
	41 int r = -1;
	42
	43 if (!islinktag)
	44 return;
	45
	46 if (strncasecmp(linktype, STRP("application/atom")) &&
	47 strncasecmp(linktype, STRP("application/xml")) &&
	48 strncasecmp(linktype, STRP("application/rss")))
	49 return;
	50
	51 /* parse base URI each time: it can change. */
	52 if (basehref[0] &&
	53 uri_parse(linkhref, &linkuri) != -1 && !linkuri.proto[0] &&
	54 uri_parse(basehref, &baseuri) != -1 &&
	55 uri_makeabs(&u, &linkuri, &baseuri) != -1 && u.proto[0])
	56 r = uri_format(buf, sizeof(buf), &u);
	57
	58 if (r >= 0 && (size_t)r < sizeof(buf))
	59 printvalue(buf);
	60 else
	61 printvalue(linkhref);
	62
	63 putchar('\t');
	64 printvalue(linktype);
	65 putchar('\n');
	66 }
	67
	68 static void
	69 xmlattrstart(XMLParser p, const char t, size_t tl, const char *a, size…
	70 {
	71 ishrefattr = istypeattr = 0;
	72
	73 if (!isbasetag && !islinktag)
	74 return;
	75
	76 if (!strcasecmp(a, "href")) {
	77 ishrefattr = 1;
	78 if (isbasetag)
	79 basehref[0] = '\0';
	80 else if (islinktag)
	81 linkhref[0] = '\0';
	82 } else if (!strcasecmp(a, "type") && islinktag) {
	83 istypeattr = 1;
	84 linktype[0] = '\0';
	85 }
	86 }
	87
	88 static void
	89 xmlattr(XMLParser p, const char t, size_t tl, const char *n, size_t nl,
	90 const char *v, size_t vl)
	91 {
	92 if (isbasetag && ishrefattr) {
	93 strlcat(basehref, v, sizeof(basehref));
	94 } else if (islinktag) {
	95 if (ishrefattr)
	96 strlcat(linkhref, v, sizeof(linkhref));
	97 else if (istypeattr)
	98 strlcat(linktype, v, sizeof(linktype));
	99 }
	100 }
	101
	102 static void
	103 xmlattrentity(XMLParser p, const char t, size_t tl, const char *a, siz…
	104 const char *v, size_t vl)
	105 {
	106 char buf[8];
	107 int len;
	108
	109 if (!ishrefattr && !istypeattr)
	110 return;
	111
	112 /* try to translate entity, else just pass as data to
	113 * xmlattr handler. */
	114 if ((len = xml_entitytostr(v, buf, sizeof(buf))) > 0)
	115 xmlattr(p, t, tl, a, al, buf, (size_t)len);
	116 else
	117 xmlattr(p, t, tl, a, al, v, vl);
	118 }
	119
	120 int
	121 main(int argc, char *argv[])
	122 {
	123 if (pledge("stdio", NULL) == -1)
	124 err(1, "pledge");
	125
	126 if (argc > 1)
	127 strlcpy(basehref, argv[1], sizeof(basehref));
	128
	129 parser.xmlattr = xmlattr;
	130 parser.xmlattrentity = xmlattrentity;
	131 parser.xmlattrstart = xmlattrstart;
	132 parser.xmltagstart = xmltagstart;
	133 parser.xmltagstartparsed = xmltagstartparsed;
	134
	135 /* NOTE: GETNEXT is defined in xml.h for inline optimization */
	136 xml_parse(&parser);
	137
	138 checkfileerror(stdin, "<stdin>", 'r');
	139 checkfileerror(stdout, "<stdout>", 'w');
	140
	141 return 0;
	142 }