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	sfeed_atom.c - sfeed - RSS and Atom parser
	git clone git://git.codemadness.org/sfeed
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	sfeed_atom.c (4200B)
	---
	1 #include <stdio.h>
	2 #include <string.h>
	3 #include <time.h>
	4
	5 #include "util.h"
	6
	7 static struct tm tmnow;
	8 static time_t now;
	9 static char *line;
	10 static size_t linesize;
	11
	12 static void
	13 printcontent(const char *s)
	14 {
	15 for (; *s; ++s) {
	16 switch (*s) {
	17 case '<': fputs("<", stdout); break;
	18 case '>': fputs(">", stdout); break;
	19 case '\'': fputs("'", stdout); break;
	20 case '&': fputs("&", stdout); break;
	21 case '"': fputs(""", stdout); break;
	22 case '\\':
	23 if (*(s + 1) == '\0')
	24 break;
	25 s++;
	26 switch (*s) {
	27 case 'n': putchar('\n'); break;
	28 case '\\': putchar('\\'); break;
	29 case 't': putchar('\t'); break;
	30 }
	31 break;
	32 default: putchar(*s);
	33 }
	34 }
	35 }
	36
	37 static void
	38 printfeed(FILE fp, const char feedname)
	39 {
	40 char fields[FieldLast], p, *tmp;
	41 struct tm parsedtm, *tm;
	42 time_t parsedtime;
	43 ssize_t linelen;
	44 int c;
	45
	46 while ((linelen = getline(&line, &linesize, fp)) > 0 &&
	47 !ferror(stdout)) {
	48 if (line[linelen - 1] == '\n')
	49 line[--linelen] = '\0';
	50 parseline(line, fields);
	51
	52 fputs("<entry>\n\t<title>", stdout);
	53 if (feedname[0]) {
	54 fputs("[", stdout);
	55 xmlencode(feedname, stdout);
	56 fputs("] ", stdout);
	57 }
	58 xmlencode(fields[FieldTitle], stdout);
	59 fputs("</title>\n", stdout);
	60 if (fields[FieldLink][0]) {
	61 fputs("\t<link rel=\"alternate\" href=\"", stdou…
	62 xmlencode(fields[FieldLink], stdout);
	63 fputs("\" />\n", stdout);
	64 }
	65 /* prefer link over id for Atom <id>. */
	66 fputs("\t<id>", stdout);
	67 if (fields[FieldLink][0])
	68 xmlencode(fields[FieldLink], stdout);
	69 else if (fields[FieldId][0])
	70 xmlencode(fields[FieldId], stdout);
	71 fputs("</id>\n", stdout);
	72 if (fields[FieldEnclosure][0]) {
	73 fputs("\t<link rel=\"enclosure\" href=\"", stdou…
	74 xmlencode(fields[FieldEnclosure], stdout);
	75 fputs("\" />\n", stdout);
	76 }
	77
	78 parsedtime = 0;
	79 if (strtotime(fields[FieldUnixTimestamp], &parsedtime) \|\|
	80 !(tm = gmtime_r(&parsedtime, &parsedtm)))
	81 tm = &tmnow;
	82 fprintf(stdout, "\t<updated>%04d-%02d-%02dT%02d:%02d:%02…
	83 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
	84 tm->tm_hour, tm->tm_min, tm->tm_sec);
	85
	86 if (fields[FieldAuthor][0]) {
	87 fputs("\t<author><name>", stdout);
	88 xmlencode(fields[FieldAuthor], stdout);
	89 fputs("</name></author>\n", stdout);
	90 }
	91 if (fields[FieldContent][0]) {
	92 if (!strcmp(fields[FieldContentType], "html")) {
	93 fputs("\t<content type=\"html\">", stdou…
	94 } else {
	95 /* NOTE: an RSS/Atom viewer may or may n…
	96 * whitespace such as newlines.
	97 * Workaround: type="html" and <![CDATA[…
	98 fputs("\t<content>", stdout);
	99 }
	100 printcontent(fields[FieldContent]);
	101 fputs("</content>\n", stdout);
	102 }
	103 for (p = fields[FieldCategory]; (tmp = strchr(p, '\|')); …
	104 c = *tmp;
	105 tmp = '\0'; / temporary NUL-terminate */
	106 if (*p) {
	107 fputs("\t<category term=\"", stdout);
	108 xmlencode(p, stdout);
	109 fputs("\" />\n", stdout);
	110 }
	111 tmp = c; / restore */
	112 }
	113 fputs("</entry>\n", stdout);
	114 }
	115 }
	116
	117 int
	118 main(int argc, char *argv[])
	119 {
	120 struct tm *tm;
	121 FILE *fp;
	122 char *name;
	123 int i;
	124
	125 if (pledge(argc == 1 ? "stdio" : "stdio rpath", NULL) == -1)
	126 err(1, "pledge");
	127
	128 if ((now = time(NULL)) == (time_t)-1)
	129 errx(1, "time");
	130 if (!(tm = gmtime_r(&now, &tmnow)))
	131 err(1, "gmtime_r: can't get current time");
	132
	133 fputs("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
	134 "<feed xmlns=\"http://www.w3.org/2005/Atom\">\n"
	135 "\t<title>Newsfeed</title>\n", stdout);
	136 printf("\t<id>urn:newsfeed:%lld</id>\n"
	137 "\t<updated>%04d-%02d-%02dT%02d:%02d:%02dZ</updated>\n",
	138 (long long)now,
	139 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
	140 tm->tm_hour, tm->tm_min, tm->tm_sec);
	141
	142 if (argc == 1) {
	143 printfeed(stdin, "");
	144 checkfileerror(stdin, "<stdin>", 'r');
	145 } else {
	146 for (i = 1; i < argc; i++) {
	147 if (!(fp = fopen(argv[i], "r")))
	148 err(1, "fopen: %s", argv[i]);
	149 name = ((name = strrchr(argv[i], '/'))) ? name +…
	150 printfeed(fp, name);
	151 checkfileerror(fp, argv[i], 'r');
	152 checkfileerror(stdout, "<stdout>", 'w');
	153 fclose(fp);
	154 }
	155 }
	156
	157 fputs("</feed>\n", stdout);
	158
	159 checkfileerror(stdout, "<stdout>", 'w');
	160
	161 return 0;
	162 }