progs/samples: silence warnings
[mesa.git] / progs / samples / loadppm.c
1
2 typedef struct {
3 size_t sizeX, sizeY;
4 GLubyte *data;
5 } PPMImage;
6
7 static PPMImage *LoadPPM(const char *filename)
8 {
9 char buff[16];
10 PPMImage *result;
11 FILE *fp;
12 int maxval, w, h;
13
14 fp = fopen(filename, "rb");
15 if (!fp)
16 {
17 fprintf(stderr, "Unable to open file `%s'\n", filename);
18 exit(1);
19 }
20
21 if (!fgets(buff, sizeof(buff), fp))
22 {
23 perror(filename);
24 exit(1);
25 }
26
27 if (buff[0] != 'P' || buff[1] != '6')
28 {
29 fprintf(stderr, "Invalid image format (must be `P6')\n");
30 exit(1);
31 }
32
33 result = (PPMImage *) malloc(sizeof(PPMImage));
34 if (!result)
35 {
36 fprintf(stderr, "Unable to allocate memory\n");
37 exit(1);
38 }
39
40 if (fscanf(fp, "%d %d", &w, &h) != 2)
41 {
42 fprintf(stderr, "Error loading image `%s'\n", filename);
43 exit(1);
44 }
45 result->sizeX = w;
46 result->sizeY = h;
47
48 if (fscanf(fp, "%d", &maxval) != 1)
49 {
50 fprintf(stderr, "Error loading image `%s'\n", filename);
51 exit(1);
52 }
53
54 while (fgetc(fp) != '\n')
55 ;
56
57 result->data = (GLubyte *) malloc(3 * result->sizeX * result->sizeY);
58 if (!result)
59 {
60 fprintf(stderr, "Unable to allocate memory\n");
61 exit(1);
62 }
63
64 if (fread(result->data, 3 * result->sizeX, result->sizeY, fp) != result->sizeY)
65 {
66 fprintf(stderr, "Error loading image `%s'\n", filename);
67 exit(1);
68 }
69
70 fclose(fp);
71
72 return result;
73 }
74