diff options
| -rw-r--r-- | ptinline.c | 23 |
1 files changed, 17 insertions, 6 deletions
@@ -1,6 +1,7 @@ #include <u.h> #include <libc.h> #include <draw.h> +#include <ctype.h> int max(int a, int b) @@ -46,7 +47,7 @@ ptinline(Point p, Point q, Point t) void usage(void) { - fprint(2, "usage: %s\n", argv0); + fprint(2, "usage: %s x0 y0 x1 y1\n", argv0); exits("usage"); } @@ -61,22 +62,32 @@ main(int argc, char *argv[]) ARGBEGIN{ default: usage(); }ARGEND; - if(argc > 0) + if(argc != 4) usage(); - pts[0] = Pt(0,0); - pts[1] = Pt(2,2); + pts[0].x = strtol(argv[0], &p, 10); + if(*p != 0) + usage(); + pts[0].y = strtol(argv[1], &p, 10); + if(*p != 0) + usage(); + pts[1].x = strtol(argv[2], &p, 10); + if(*p != 0) + usage(); + pts[1].y = strtol(argv[3], &p, 10); + if(*p != 0) + usage(); while((n = read(0, buf, sizeof(buf)-1)) > 0){ buf[n-1] = buf[n] = 0; pts[2].x = strtol(buf, &p, 10); - if(p == nil || *p == 0){ + if(!isspace(*p)){ fprint(2, "wrong x coordinate\n"); continue; } pts[2].y = strtol(p, &p, 10); - if(p == nil || *p != 0){ + if(*p != 0){ fprint(2, "wrong y coordinate\n"); continue; } |