DeforaNetworks/deepstate
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Adds support for --help.

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This commit is contained in:
Peter Goodman 2018-07-25 15:34:07 -04:00
parent 5d5e0087da
commit a2ec146657
1 changed files with 20 additions and 6 deletions
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26
src/lib/Option.c
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@ -21,6 +21,8 @@
#include <stdio.h>
#include <string.h>
DEFINE_bool(help, false, "Show the usage message.");
enum {
kMaxNumOptions = 32,
kMaxOptionLength = 1024 - 1
@ -204,6 +206,11 @@ void DeepState_InitOptions(int argc, ...) {
ProcessOptionString();
DeepState_OptionsAreInitialized = 1;
ProcessPendingOptions();
if (FLAGS_help) {
DeepState_PrintAllOptions(argv[0]);
exit(0);
}
}
enum {
@ -239,25 +246,32 @@ static const char *BufferDocString(char *buff, const char *docstring) {
/* Works for --help option: print out each options along with their document. */
void DeepState_PrintAllOptions(const char *prog_name) {
fprintf(stderr, "Usage: %s <options>\n\n", prog_name);
char buff[4096];
ssize_t write_len = 0;
char line_buff[kLineLength];
struct DeepState_Option *option = DeepState_Options;
struct DeepState_Option *next_option = NULL;
sprintf(buff, "Usage: %s <options>\n\n", prog_name);
write_len = write(STDERR_FILENO, buff, strlen(buff));
for (; option != NULL; option = next_option) {
next_option = option->next;
fprintf(stderr, "--%s", option->name);
sprintf(buff, "--%s", option->name);
write_len = write(STDERR_FILENO, buff, strlen(buff));
const char *docstring = option->docstring;
do {
docstring = BufferDocString(line_buff, docstring);
fprintf(stderr, "\n %s", line_buff);
sprintf(buff, "\n %s", line_buff);
write_len = write(STDERR_FILENO, buff, strlen(buff));
} while (*docstring);
fprintf(stderr, "\n\n");
write_len = write(STDERR_FILENO, "\n\n", 2);
}
(void) write_len; /* Deal with -Wunused-result. */
}
/* Initialize an option. */
void DeepState_AddOption(struct DeepState_Option *option) {
if (DeepState_OptionsAreInitialized) {