From a96f4771294601a9b3a9b7719ae489b5f90ca15e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Tue, 15 Jan 2019 22:45:59 +0100
Subject: Initial commit.

---
 parse.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 parse.c

(limited to 'parse.c')

diff --git a/parse.c b/parse.c
new file mode 100644
index 00000000..ba2a5a07
--- /dev/null
+++ b/parse.c
@@ -0,0 +1,110 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+typedef enum {
+	key, value
+} context;
+
+typedef struct  {
+	char *key, *value;
+} kvpair;
+
+/*
+ * Max length of a line.
+ * TODO update this to allow longer lines, in case someone doesn't
+ * follow the standard.
+ */
+#define SEGSIZE 75
+
+int ii = 0;
+
+#define MARK do { printf("%i -- %i\n", __LINE__, ii++); } while (0)
+
+#define ERR(x) do { \
+	fprintf(stderr, "ERR %i: %s", __LINE__, (x)); \
+} while(0)
+
+
+int main (int argc, char* argv[argc]) {
+	FILE* F = fopen(argv[1], "r");
+
+	int segments = 1;
+	char* str = malloc(segments * SEGSIZE);
+	int i = 0;
+
+	context ctx = key;
+	kvpair kvs[100];
+	int ki = 0;
+
+	char c;
+	while ( (c = fgetc(F)) != EOF) {
+		/*
+		 * A carrige return means that the current line is at an
+		 * end. The following character should always be \n.
+		 * However, if the first character on the next line is a
+		 * whitespace then the two lines should be concatenated.
+		 */
+		if (c == '\r') {
+
+			char s[2];
+			s[0] = fgetc(F);
+			s[1] = fgetc(F);
+
+			if (s[0] != '\n') { ERR("expected newline after CR"); }
+			else if (s[1] == ' ' || s[1] == '\t') {
+				MARK;
+				// TODO check return value
+				// TODO segments is always incremented here, meaning
+				// that segment grows larger for every multi line
+				// encountered.
+				str = realloc(str, ++segments * SEGSIZE);
+				if (str == NULL) { /* TODO signal error */
+					exit (1);
+				}
+				continue;
+			} else {
+				MARK;
+				if (ungetc(s[1], F) != s[1]) { /* TODO signal error */
+					exit (2);
+				}
+
+				/* At TRUE end of line */
+				kvs[ki].value = malloc(i + 1);
+				memcpy(kvs[ki].value, str, i);
+				kvs[ki].value[i] = 0;
+				ki++;
+				i = 0;
+				ctx = key;
+				continue;
+			}
+		} else if (ctx == key && c == ':') {
+			kvs[ki].key = malloc(i + 1);
+			memcpy(kvs[ki].key, str, i);
+			kvs[ki].key[i] = 0;
+			printf("key := %s\n", kvs[ki].key);
+			i = 0;
+			ctx = value;
+			continue;
+		}
+
+		str[i] = c;
+		++i;
+	}
+	if (errno != 0) {
+		printf("Error parsing, errno = %i\n", errno);
+	}
+	puts("File parsed");
+	free(str);
+
+	/*
+	 * Just print and free all collected data
+	 */
+	for (int i = 0; i < ki; i++) {
+		printf("[%s] := [%s]\n", kvs[i].key, kvs[i].value);
+		free(kvs[i].key);
+		free(kvs[i].value);
+	}
+
+}
-- 
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