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Usage messages if jq is run with no arguments.

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Beats segfaulting.
This commit is contained in:
Stephen Dolan
2012-09-18 23:37:46 +01:00
parent 5863160112
commit 305059ff9f
1 changed files with 13 additions and 0 deletions
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13
main.c
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@ -8,7 +8,20 @@
#include "parser.h"
#include "execute.h"
static const char* progname;
static void usage() {
fprintf(stderr, "\njq - commandline JSON processor\n");
fprintf(stderr, "Usage: %s <jq filter>\n\n", progname);
fprintf(stderr, "For a description of how to write jq filters and\n");
fprintf(stderr, "why you might want to, see the jq documentation at\n");
fprintf(stderr, "http://stedolan.github.com/jq\n\n");
exit(1);
}
int main(int argc, char* argv[]) {
if (argc) progname = argv[0];
if (argc != 2 || !strcmp(argv[1], "--help") || !strcmp(argv[1], "--version")) usage();
struct bytecode* bc = jq_compile(argv[1]);
if (!bc) return 1;