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seq: Add help option

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Added a help option to the seq command that gives usage information. Further,
when a user gives an incorrect argument, usage is supplied on stderr.
This commit is contained in:
Matthew L. Curry 2020-10-11 16:40:27 -06:00 committed by Andreas Kling
parent 7b481a2c73
commit a45ba638a7
Notes: sideshowbarker 2024-07-19 01:53:51 +09:00 
Author: https://github.com/mlcurry
Commit: https://github.com/SerenityOS/serenity/commit/a45ba638a77
Pull-request: https://github.com/SerenityOS/serenity/pull/3749
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/asynts
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/nico
1 changed files with 23 additions and 1 deletions
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24
Userland/seq.cpp
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@ -30,12 +30,26 @@
#include <string.h>
#include <unistd.h>
const char* g_usage = R"(Usage:
seq [-h|--help]
seq LAST
seq FIRST LAST
seq FIRST INCREMENT LAST
)";
static void print_usage(FILE* stream)
{
fprintf(stream, g_usage);
return;
}
static double get_double(const char* name, const char* d_string, int* number_of_decimals)
{
char* end;
double d = strtod(d_string, &end);
if (d == 0 && end == d_string) {
fprintf(stderr, "%s: invalid double value \"%s\"\n", name, d_string);
fprintf(stderr, "%s: invalid argument \"%s\"\n", name, d_string);
print_usage(stderr);
exit(1);
}
if (char* dot = strchr(d_string, '.'))
@ -56,6 +70,13 @@ int main(int argc, const char* argv[])
return 1;
}
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "-h") == 0) {
print_usage(stdout);
exit(0);
}
}
double start = 1, step = 1, end = 1;
int number_of_start_decimals = 0, number_of_step_decimals = 0, number_of_end_decimals = 0;
switch (argc) {
@ -73,6 +94,7 @@ int main(int argc, const char* argv[])
break;
default:
fprintf(stderr, "%s: unexpected number of arguments\n", argv[0]);
print_usage(stderr);
return 1;
}