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	sfeed_json.c - sfeed - RSS and Atom parser
	git clone git://git.codemadness.org/sfeed
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	---
	sfeed_json.c (3719B)
	---
	1 #include <stdio.h>
	2 #include <string.h>
	3 #include <time.h>
	4
	5 #include "util.h"
	6
	7 static char *line;
	8 static size_t linesize;
	9 static int firstitem = 1;
	10
	11 /* Unescape / decode fields printed by string_print_encoded() */
	12 static void
	13 printcontent(const char *s)
	14 {
	15 for (; *s; s++) {
	16 switch (*s) {
	17 case '\\':
	18 if (*(s + 1) == '\0')
	19 break;
	20 s++;
	21 switch (*s) {
	22 case 'n': fputs("\\n", stdout); break;
	23 case '\\': fputs("\\\\", stdout); break;
	24 case 't': fputs("\\t", stdout); break;
	25 }
	26 break; /* ignore invalid escape sequence */
	27 case '"': fputs("\\\"", stdout); break;
	28 default:
	29 putchar(*s);
	30 break;
	31 }
	32 }
	33 }
	34
	35 static void
	36 printfield(const char *s)
	37 {
	38 for (; *s; s++) {
	39 if (*s == '\\')
	40 fputs("\\\\", stdout);
	41 else if (*s == '"')
	42 fputs("\\\"", stdout);
	43 else
	44 putchar(*s);
	45 }
	46 }
	47
	48 static void
	49 printfeed(FILE fp, const char feedname)
	50 {
	51 char *fields[FieldLast], timebuf[32];
	52 struct tm parsedtm, *tm;
	53 time_t parsedtime;
	54 ssize_t linelen;
	55 int ch;
	56 char p, s;
	57
	58 while ((linelen = getline(&line, &linesize, fp)) > 0 &&
	59 !ferror(stdout)) {
	60 if (line[linelen - 1] == '\n')
	61 line[--linelen] = '\0';
	62 parseline(line, fields);
	63
	64 if (!firstitem)
	65 fputs(",\n", stdout);
	66 firstitem = 0;
	67
	68 fputs("{\n\t\"id\": \"", stdout);
	69 printfield(fields[FieldId]);
	70 fputs("\"", stdout);
	71
	72 parsedtime = 0;
	73 if (!strtotime(fields[FieldUnixTimestamp], &parsedtime) …
	74 (tm = gmtime_r(&parsedtime, &parsedtm)) &&
	75 strftime(timebuf, sizeof(timebuf), "%Y-%m-%dT%H:%M:%…
	76 fputs(",\n\t\"date_published\": \"", stdout);
	77 fputs(timebuf, stdout);
	78 fputs("\"", stdout);
	79 }
	80
	81 fputs(",\n\t\"title\": \"", stdout);
	82 if (feedname[0]) {
	83 fputs("[", stdout);
	84 printfield(feedname);
	85 fputs("] ", stdout);
	86 }
	87 printfield(fields[FieldTitle]);
	88 fputs("\"", stdout);
	89
	90 if (fields[FieldLink][0]) {
	91 fputs(",\n\t\"url\": \"", stdout);
	92 printfield(fields[FieldLink]);
	93 fputs("\"", stdout);
	94 }
	95
	96 if (fields[FieldAuthor][0]) {
	97 fputs(",\n\t\"authors\": [{\"name\": \"", stdout…
	98 printfield(fields[FieldAuthor]);
	99 fputs("\"}]", stdout);
	100 }
	101
	102 if (fields[FieldCategory][0]) {
	103 fputs(",\n\t\"tags\": [", stdout);
	104
	105 for (p = s = fields[FieldCategory]; ; s++) {
	106 if (s == '\|' \|\| s == '\0') {
	107 if (p != fields[FieldCategory])
	108 fputs(", ", stdout);
	109 ch = *s;
	110 s = '\0'; / temporary NUL term…
	111 fputs("\"", stdout);
	112 printfield(p);
	113 fputs("\"", stdout);
	114 s = ch; / restore */
	115 p = s + 1;
	116 }
	117 if (*s == '\0')
	118 break;
	119 }
	120 fputs("]", stdout);
	121 }
	122
	123 if (fields[FieldEnclosure][0]) {
	124 fputs(",\n\t\"attachments\": [{\"url\": \"", std…
	125 printfield(fields[FieldEnclosure]);
	126 fputs("\"}]", stdout);
	127 }
	128
	129 if (!strcmp(fields[FieldContentType], "html"))
	130 fputs(",\n\t\"content_html\": \"", stdout);
	131 else
	132 fputs(",\n\t\"content_text\": \"", stdout);
	133 printcontent(fields[FieldContent]);
	134 fputs("\"\n}", stdout);
	135 }
	136 }
	137
	138 int
	139 main(int argc, char *argv[])
	140 {
	141 FILE *fp;
	142 char *name;
	143 int i;
	144
	145 if (pledge(argc == 1 ? "stdio" : "stdio rpath", NULL) == -1)
	146 err(1, "pledge");
	147
	148 fputs("{\n"
	149 "\"version\": \"https://jsonfeed.org/version/1.1\",\n"
	150 "\"title\": \"Newsfeed\",\n"
	151 "\"items\": [\n", stdout);
	152
	153 if (argc == 1) {
	154 printfeed(stdin, "");
	155 checkfileerror(stdin, "<stdin>", 'r');
	156 } else {
	157 for (i = 1; i < argc; i++) {
	158 if (!(fp = fopen(argv[i], "r")))
	159 err(1, "fopen: %s", argv[i]);
	160 name = ((name = strrchr(argv[i], '/'))) ? name +…
	161 printfeed(fp, name);
	162 checkfileerror(fp, argv[i], 'r');
	163 checkfileerror(stdout, "<stdout>", 'w');
	164 fclose(fp);
	165 }
	166 }
	167 fputs("]\n}\n", stdout);
	168
	169 checkfileerror(stdout, "<stdout>", 'w');
	170
	171 return 0;
	172 }