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json_parse demo: fix and use usage() function

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This commit is contained in:
Pierce Lopez
2020-05-08 18:27:35 -04:00
parent 22870ac2bd
commit 090ae4e4d4
1 changed files with 6 additions and 7 deletions
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13
apps/json_parse.c
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@@ -31,7 +31,6 @@ static const char *fname = NULL;
#define json_tokener_get_parse_end(tok) ((tok)->char_offset) #define json_tokener_get_parse_end(tok) ((tok)->char_offset)
#endif #endif
static void usage(int exitval, const char *errmsg);
static void showmem(void); static void showmem(void);
static int parseit(int fd, int (*callback)(struct json_object *)); static int parseit(int fd, int (*callback)(struct json_object *));
static int showobj(struct json_object *new_obj); static int showobj(struct json_object *new_obj);
@@ -137,14 +136,15 @@ static int showobj(struct json_object *new_obj)
return 0; return 0;
} }
static void usage(int exitval, const char *errmsg) static void usage(const char *argv0, int exitval, const char *errmsg)
{ {
FILE *fp = stdout; FILE *fp = stdout;
if (exitval != 0) if (exitval != 0)
fp = stderr; fp = stderr;
if (errmsg != NULL) if (errmsg != NULL)
fprintf(fp, "ERROR: %s\n\n", errmsg); fprintf(fp, "ERROR: %s\n\n", errmsg);
fprintf(fp, "Usage: %s [-f] [-n] [-s]\n");
fprintf(fp, "Usage: %s [-f] [-n] [-s]\n", argv0);
fprintf(fp, " -f - Format the output with JSON_C_TO_STRING_PRETTY\n"); fprintf(fp, " -f - Format the output with JSON_C_TO_STRING_PRETTY\n");
fprintf(fp, " -n - No output\n"); fprintf(fp, " -n - No output\n");
fprintf(fp, " -s - Parse in strict mode, flags:\n"); fprintf(fp, " -s - Parse in strict mode, flags:\n");
@@ -167,16 +167,15 @@ int main(int argc, char **argv)
case 'f': formatted_output = 1; break; case 'f': formatted_output = 1; break;
case 'n': show_output = 0; break; case 'n': show_output = 0; break;
case 's': strict_mode = 1; break; case 's': strict_mode = 1; break;
default: /* '?' */ fprintf(stderr, "Usage: %s [-f]\n", argv[0]); exit(EXIT_FAILURE); default: /* '?' */ usage(argv[0], EXIT_FAILURE, NULL);
} }
} }
if (optind >= argc) if (optind >= argc)
{ {
fprintf(stderr, "Expected argument after options\n"); usage(argv[0], EXIT_FAILURE, "Expected argument after options");
exit(EXIT_FAILURE);
} }
fname = argv[optind]; fname = argv[optind];
int fd = open(argv[optind], O_RDONLY, 0); int fd = open(argv[optind], O_RDONLY, 0);
showmem(); showmem();
if (parseit(fd, showobj) != 0) if (parseit(fd, showobj) != 0)