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tiffdither: print usage on stdout when -h is used

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see #17
This commit is contained in:
Thomas Bernard 2020-03-07 15:47:12 +01:00
parent 08b99340ee
commit 68564877c7
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GPG Key ID: 0FF11B67A5C0863C
1 changed files with 27 additions and 19 deletions
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46
tools/tiffdither.c
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@ -39,6 +39,13 @@
#include "tiffio.h"
#include "tiffiop.h"
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif
#define streq(a,b) (strcmp(a,b) == 0)
#define strneq(a,b,n) (strncmp(a,b,n) == 0)
@ -49,7 +56,7 @@ uint32 imagewidth;
uint32 imagelength;
int threshold = 128;
static void usage(void);
static void usage(int code);
/*
* Floyd-Steinberg error propragation with threshold.
@ -166,7 +173,7 @@ processG3Options(char* cp)
else if (strneq(cp, "fill", 4))
group3options |= GROUP3OPT_FILLBITS;
else
usage();
usage(EXIT_FAILURE);
} while ((cp = strchr(cp, ':')));
}
}
@ -213,11 +220,11 @@ main(int argc, char* argv[])
extern char *optarg;
#endif
while ((c = getopt(argc, argv, "c:f:r:t:")) != -1)
while ((c = getopt(argc, argv, "c:f:r:t:h")) != -1)
switch (c) {
case 'c': /* compression scheme */
if (!processCompressOptions(optarg))
usage();
usage(EXIT_FAILURE);
break;
case 'f': /* fill order */
if (streq(optarg, "lsb2msb"))
@ -225,7 +232,7 @@ main(int argc, char* argv[])
else if (streq(optarg, "msb2lsb"))
fillorder = FILLORDER_MSB2LSB;
else
usage();
usage(EXIT_FAILURE);
break;
case 'r': /* rows/strip */
rowsperstrip = atoi(optarg);
@ -237,29 +244,31 @@ main(int argc, char* argv[])
else if (threshold > 255)
threshold = 255;
break;
case 'h':
usage(EXIT_SUCCESS);
case '?':
usage();
usage(EXIT_FAILURE);
/*NOTREACHED*/
}
if (argc - optind < 2)
usage();
usage(EXIT_FAILURE);
in = TIFFOpen(argv[optind], "r");
if (in == NULL)
return (-1);
return (EXIT_FAILURE);
TIFFGetField(in, TIFFTAG_SAMPLESPERPIXEL, &samplesperpixel);
if (samplesperpixel != 1) {
fprintf(stderr, "%s: Not a b&w image.\n", argv[0]);
return (-1);
return (EXIT_FAILURE);
}
TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bitspersample);
if (bitspersample != 8) {
fprintf(stderr,
" %s: Sorry, only handle 8-bit samples.\n", argv[0]);
return (-1);
return (EXIT_FAILURE);
}
out = TIFFOpen(argv[optind+1], "w");
if (out == NULL)
return (-1);
return (EXIT_FAILURE);
CopyField(TIFFTAG_IMAGEWIDTH, imagewidth);
TIFFGetField(in, TIFFTAG_IMAGELENGTH, &imagelength);
TIFFSetField(out, TIFFTAG_IMAGELENGTH, imagelength-1);
@ -293,10 +302,10 @@ main(int argc, char* argv[])
fsdither(in, out);
TIFFClose(in);
TIFFClose(out);
return (0);
return (EXIT_SUCCESS);
}
char* stuff[] = {
static const char* stuff[] = {
"usage: tiffdither [options] input.tif output.tif",
"where options are:",
" -r # make each strip have no more than # rows",
@ -323,16 +332,15 @@ NULL
};
static void
usage(void)
usage(int code)
{
char buf[BUFSIZ];
int i;
FILE * out = (code == EXIT_SUCCESS) ? stdout : stderr;
setbuf(stderr, buf);
fprintf(stderr, "%s\n\n", TIFFGetVersion());
fprintf(out, "%s\n\n", TIFFGetVersion());
for (i = 0; stuff[i] != NULL; i++)
fprintf(stderr, "%s\n", stuff[i]);
exit(-1);
fprintf(out, "%s\n", stuff[i]);
exit(code);
}
/* vim: set ts=8 sts=8 sw=8 noet: */