sigmasternchen/libsfuid
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added help + better error messages

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This commit is contained in:
overflowerror 2019-01-17 16:09:18 +01:00
parent f06c8f68b1
commit c8bd4d71ab
1 changed files with 25 additions and 11 deletions
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36
main.c
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@ -58,7 +58,7 @@ unsigned long long convertFromString(const char* string) {
} }
} }
if (!found) { if (!found) {
error("Parsing error.\n"); error("Parsing error.\nUnexpected character '%c'.\n", string[i]);
exit(3); exit(3);
} }
} }
@ -167,7 +167,7 @@ settings_t getSettings() {
maxBits = findMax(maxValue); maxBits = findMax(maxValue);
if (maxBits <= 0) { if (maxBits <= 0) {
error("length or charset is too big."); error("Length or charset is too big. This should not have happend.\n");
exit(3); exit(3);
} }
} }
@ -258,26 +258,37 @@ void prepareCharset() {
charset = inflatedCharset; charset = inflatedCharset;
} }
int main(int argc, char** argv) { void help(const char* name) {
int opt; printf("SYNOPSIS: %s [OPTIONS] INPUT\n\n", name);
printf("options: \n");
printf(" -e encode INPUT (default)\n");
printf(" -d decode INPUT\n");
printf(" -l LENGTH set the length (default: 10)\n");
printf(" -c CHARSET set the charset (default: a-zA-Z0-9)\n");
printf(" -o OFFSET set the offset (default: 5)\n");
printf(" -v enable verbose mode\n");
printf(" -h show this help message\n\n");
}
int main(int argc, char** argv) {
bool decodeMode = false; bool decodeMode = false;
int opt;
char* endptr; char* endptr;
while((opt = getopt(argc, argv, "o:c:l:dev")) != -1) { while((opt = getopt(argc, argv, "o:c:l:devh")) != -1) {
switch(opt) { switch(opt) {
case 'o': case 'o':
offset = strtol(optarg, &endptr, 10); offset = strtol(optarg, &endptr, 10);
if (*endptr != 0) { if (*endptr != 0) {
error("Argument for -o has to be a number.\n"); error("Argument for -o has to be a number.\nTry -h to get help.\n");
exit(2); exit(2);
} }
break; break;
case 'l': case 'l':
resultLength = strtol(optarg, &endptr, 10); resultLength = strtol(optarg, &endptr, 10);
if (*endptr != 0) { if (*endptr != 0) {
error("Argument of -l has to be a number.\n"); error("Argument of -l has to be a number.\nTry -h to get help.\n");
exit(2); exit(2);
} }
break; break;
@ -293,14 +304,17 @@ int main(int argc, char** argv) {
case 'v': case 'v':
verbose = true; verbose = true;
break; break;
case 'h':
help(argv[0]);
exit(0);
default: default:
error("Unknown option.\n"); error("Unknown option.\nTry -h to get help.\n");
exit(2); exit(2);
} }
} }
if (optind >= argc) { if (optind >= argc) {
error("Expected data after options.\n"); error("Expected data after options.\nTry -h to get help.\n");
exit(2); exit(2);
} }
@ -322,12 +336,12 @@ int main(int argc, char** argv) {
} else { } else {
unsigned long long value = strtoll(argv[optind], &endptr, 10); unsigned long long value = strtoll(argv[optind], &endptr, 10);
if (*endptr != 0) { if (*endptr != 0) {
error("Value has to be a number.\n"); error("Value has to be a number for encoding.\n");
exit(2); exit(2);
} }
value += offset; value += offset;
if (value > settings.max) { if (value > settings.max) {
error("value is too big!\n"); error("value is too big!\nThe maximum value for the current settings is %llu.\n", settings.max - offset);
exit(1); exit(1);
} }
verbose("encode mode\n"); verbose("encode mode\n");