convert threadtime format logcat into csv file

logcat-threadtime_to_csv.c

#include <stdio.h>
#include <stdlib.h>

int main(int argv, char *argc[])
{
	if (argv!=2)
	{
		printf("Usage: %s \"threadtime_format_logcat_file\"\n",__FILE__);
		exit(-1);
	}

	FILE *I=fopen(argc[1],"r");
	FILE *O=fopen(strcat(argc[1],".csv"),"w");

	if (I==NULL)
	{
		exit(-2);
		printf("Input file error.\n");
	}
	if (O==NULL)
	{
		exit(-3);
		printf("Output file error.\n");
	}
	printf("File open all okey.\n");

	char c;
	int col=1;
	int tagORmsg=0;//0:tag 1:msg
	int nl=1;//0:not empty newline 1:now at empty new line
	while ((c=fgetc(I))!=EOF)
	{
		switch (col)
		{
			case  6:
			case 19:
			case 25:
			case 31:
			case 33:
				fprintf(O,",");
				break;

			case 20:
			case 21:
			case 22:
			case 23:
			case 24:
			case 26:
			case 27:
			case 28:
			case 29:
			case 30:
				if (c!=' ')
					fprintf(O,"%c",c);//print 2 integers but ignore space
				break;

			default:
				if (col<33)//before tag
				{
					if ((c==0x0D)||(c==0x0A))
					{
						col--;//fprintf(O,"%c",c);//ignore second, third... new line char
					}
					else
					{
						fprintf(O,"%c",c);
					}
				}
				else if (tagORmsg==0)//tag
				{
					if (c!=':'&&c!=' ')
					{
						fprintf(O,"%c",c);
					}
					else if (c==':')//c==':'
					{
						fprintf(O,",\"");
						c=fgetc(I);
						tagORmsg=1;
					}
				}
				else//print all msg, replace " with '
				{
					if ((c==0x0D)||(c==0x0A))
					{
						if (col!=1)
						{
							fprintf(O,"\"\n");
							col=1;
							nl=1;
							tagORmsg=0;
						}
						col--;
					}
					else if (c!='"')
					{
						fprintf(O,"%c",c);
					}
					else
					{
						fprintf(O,"'",c);
					}
				}
				break;
		}
		col++;
	}

	fclose(I);
	fclose(O);

	return 0;
}