Second

1 files changed, 81 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..7def025
--- /dev/null
+++ b/main.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <assert.h>
+
+#include "parser.h"
+
+char* readfile(const char *fname){
+	FILE *f=fopen(fname,"rb");
+	if(!f)return NULL;
+	if(fseek(f,0,SEEK_END)==-1){fclose(f); return NULL;}
+	long flen=ftell(f);
+	if(flen==-1){fclose(f); return NULL;}
+	rewind(f);
+
+	char *buf=malloc(flen+1);
+	if(!buf){fclose(f); return NULL;}
+	fread(buf,1,flen,f);
+	if(ferror(f)){fclose(f); free(buf); return NULL;}
+	if(memchr(buf,'\0',flen)!=NULL){
+		fprintf(stderr,"Invalid null char in file '%s'\n",fname);
+		exit(1);
+	}
+	buf[flen]='\0';
+	fclose(f);
+	return buf;
+}
+
+char *readstdin(void){
+	int bufsz=1024,cursor=0;
+	char *buf=malloc(bufsz);
+	if(!buf)return NULL;
+	while(true){
+		if(cursor==bufsz-1){
+			bufsz*=2;
+			char *newbuf=realloc(buf,bufsz);
+			if(!newbuf){
+				free(buf);
+				return NULL;
+			}
+			buf=newbuf;
+		}
+		int nread=fread(buf,1,bufsz-cursor-1,stdin);
+		if(nread>0&&memchr(buf,'\0',nread)!=NULL){
+			fprintf(stderr,"Invalid null char on stdin file\n");
+			exit(1);
+		}
+		cursor+=nread;
+		if(nread<bufsz-cursor-1){
+			if(feof(stdin))break;
+			if(ferror(stdin)){
+				free(buf);
+				return NULL;
+			}
+		}
+	}
+	buf[cursor]='\0';
+	return buf;
+}
+
+
+void usage(const char *argv0){
+	fprintf(stderr,"Usage: %s <source file>\n",argv0);
+}
+
+int main(int argc,char **argv){
+	if(argc!=2){
+		usage(argv[0]);
+		return 1;
+	}
+	char *source;
+	if(strcmp(argv[1],"-")==0)source=readstdin();
+	else source=readfile(argv[1]);
+	if(!source){
+		fprintf(stderr,"Error reading %s\n",strcmp(argv[1],"-")==0?"from stdin":argv[1]);
+		return 1;
+	}
+
+	;
+}