Check return value of 'plotbegin()' in all programs and exit if it's …

…negative. Only 'allover12.c' and 'pconic.c' omitted.
anachrocomputer · Aug 11, 2020 · 8d8638c · 8d8638c
1 parent 5b7405b
commit 8d8638c
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Showing 34 changed files with 137 additions and 35 deletions.
diff --git a/allover13.c b/allover13.c
@@ -52,7 +52,10 @@ int main(int argc, char * const argv[])
    Scale = 40.0;
    pitch = 45.0 * Scale;
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/arches.c b/arches.c
@@ -38,7 +38,10 @@ int main(int argc, char * const argv[])
    }
 
    /* Select first pen and draw border */
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/celticstep.c b/celticstep.c
@@ -57,7 +57,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/circle_lines.c b/circle_lines.c
@@ -52,7 +52,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/coords.c b/coords.c
@@ -35,7 +35,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/cs_rosette.c b/cs_rosette.c
@@ -57,7 +57,10 @@ int main(int argc, char * const argv[])
    nrings = 4;
    nlines = 16;
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/curve_stitching.c b/curve_stitching.c
@@ -49,7 +49,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/dala1.c b/dala1.c
@@ -42,7 +42,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/dala2.c b/dala2.c
@@ -84,7 +84,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/dala2c.c b/dala2c.c
@@ -52,7 +52,10 @@ int main (int argc, char * const argv[])
       }
    }
 
-   plotbegin (0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize (&maxx, &maxy);
 

diff --git a/dala3.c b/dala3.c
@@ -42,7 +42,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/ellipse.c b/ellipse.c
@@ -38,7 +38,10 @@ int main(int argc, char * const argv[])
    }
 
    /* Select first pen and draw border */
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/fraserspiral.c b/fraserspiral.c
@@ -39,7 +39,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/hyp.c b/hyp.c
@@ -42,7 +42,10 @@ int main(int argc, char *const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&X0, &Y0);
 

diff --git a/isogrid.c b/isogrid.c
@@ -40,7 +40,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/libtest.c b/libtest.c
@@ -42,7 +42,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/lissajous.c b/lissajous.c
@@ -35,7 +35,10 @@ int main(int argc, char * const argv[])
    }
 
    /* Select first pen and draw border */
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/lotus.c b/lotus.c
@@ -50,7 +50,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/morphpoly.c b/morphpoly.c
@@ -59,7 +59,10 @@ int main(int argc, char * const argv[])
 
    srand((unsigned int)time(NULL));
 
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/op_moire.c b/op_moire.c
@@ -43,7 +43,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/pappus.c b/pappus.c
@@ -41,7 +41,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/pin_and_cotton.c b/pin_and_cotton.c
@@ -62,7 +62,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/pin_circle.c b/pin_circle.c
@@ -39,7 +39,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/piscis.c b/piscis.c
@@ -34,7 +34,10 @@ int main(int argc, char * const argv[])
    }
 
    /* Select first pen and draw border */
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/poly_oval.c b/poly_oval.c
@@ -46,7 +46,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/qrplot.c b/qrplot.c
@@ -32,7 +32,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    plotPBM("qr_sample.pbm", 50.0, 0.0, 2.0);
 

diff --git a/spiralsq.c b/spiralsq.c
@@ -42,7 +42,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/sqinsq.c b/sqinsq.c
@@ -44,7 +44,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/star_grid.c b/star_grid.c
@@ -52,7 +52,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/superellipse.c b/superellipse.c
@@ -51,7 +51,10 @@ int main(int argc, char * const argv[])
    }
 
    /* Select first pen and draw border */
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/sutpent.c b/sutpent.c
@@ -45,7 +45,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(1);
+   if (plotbegin(1) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/ternary_arcs.c b/ternary_arcs.c
@@ -43,7 +43,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);
 

diff --git a/twist.c b/twist.c
@@ -37,7 +37,10 @@ int main(int argc, char * const argv[])
       }
    }
 
-   plotbegin(0);
+   if (plotbegin(0) < 0) {
+      fputs("Failed to initialise HPGL library\n", stderr);
+      exit(EXIT_FAILURE);
+   }
 
    getplotsize(&maxx, &maxy);