1 files changed, 54 insertions, 0 deletions
diff --git a/line_reader.c b/line_reader.c
new file mode 100644
index 0000000..48c8355
--- /dev/null
+++ b/line_reader.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <string.h>
+#include "line_reader.h"
+
+
+struct line_reader {
+	int fd;
+	i64 bufcap,buflen;
+	char *buffer;
+};
+
+struct line_reader* line_reader_init(int fd){
+	struct line_reader *r=malloc(1,struct line_reader);
+	r->fd=fd;
+	r->bufcap=1024;
+	r->buflen=0;
+	r->buffer=malloc(r->bufcap,char);
+	return r;
+}
+
+void line_reader_supply_data(struct line_reader *r,const char *data,i64 len){
+	bool do_realloc=false;
+	while(r->buflen+len>r->bufcap){
+		if(r->bufcap*2>LARGENUM){
+			fprintf(stderr,"Data too large in line_reader_supply_data!\n");
+			return;
+		}
+		r->bufcap*=2;
+		do_realloc=true;
+	}
+	if(do_realloc){
+		r->buffer=realloc(r->buffer,r->bufcap,char);
+	}
+	memcpy(r->buffer+r->buflen,data,len);
+	r->buflen+=len;
+}
+
+char* line_reader_get_line(struct line_reader *r,bool include_lf){
+	char *p;
+	p=memchr(r->buffer,'\n',r->buflen);
+	if(p==NULL)return NULL;
+	i64 idx=p-r->buffer;
+	char *str=malloc(idx+include_lf+1,char);
+	memcpy(str,r->buffer,idx+include_lf);
+	str[idx+include_lf]='\0';
+	memmove(r->buffer,r->buffer+idx+1,r->buflen-idx-1);
+	r->buflen-=idx+1;
+	return str;
+}
+
+void line_reader_destroy(struct line_reader *r){
+	free(r->buffer);
+	free(r);
+}