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jshn: refactor main into smaller pieces

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Turn longer switch cases into separate functions in order to make it
easier to follow. Don't return from the cases as it makes future
cleaning up harder.

Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
Petr Štetiar 2019-11-23 22:27:46 +01:00
parent 9b6ede0e53
commit 93848ec96d
1 changed files with 68 additions and 39 deletions
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107
jshn.c
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@ -333,6 +333,61 @@ static int avl_strcmp_var(const void *k1, const void *k2, void *ptr)
return c1 - c2;
}
static int jshn_parse_file(const char *path)
{
struct stat sb;
int ret = 0;
char *fbuf;
int fd;
if ((fd = open(path, O_RDONLY)) == -1) {
fprintf(stderr, "Error opening %s\n", path);
return 3;
}
if (fstat(fd, &sb) == -1) {
fprintf(stderr, "Error getting size of %s\n", path);
close(fd);
return 3;
}
if (!(fbuf = malloc(sb.st_size))) {
fprintf(stderr, "Error allocating memory for %s\n", path);
close(fd);
return 3;
}
if (read(fd, fbuf, sb.st_size) != sb.st_size) {
fprintf(stderr, "Error reading %s\n", path);
free(fbuf);
close(fd);
return 3;
}
ret = jshn_parse(fbuf);
free(fbuf);
close(fd);
return ret;
}
static int jshn_format_file(const char *path, bool no_newline, bool indent)
{
FILE *fp = NULL;
int ret = 0;
fp = fopen(path, "w");
if (!fp) {
fprintf(stderr, "Error opening %s\n", path);
return 3;
}
ret = jshn_format(no_newline, indent, fp);
fclose(fp);
return ret;
}
int main(int argc, char **argv)
{
extern char **environ;
@ -340,12 +395,8 @@ int main(int argc, char **argv)
bool indent = false;
struct env_var *vars;
int i;
int ret = 0;
int ch;
int fd;
FILE *fp = NULL;
struct stat sb;
char *fbuf;
int ret;
avl_init(&env_vars, avl_strcmp_var, false, NULL);
for (i = 0; environ[i]; i++);
@ -374,43 +425,17 @@ int main(int argc, char **argv)
var_prefix_len = strlen(var_prefix);
break;
case 'r':
return jshn_parse(optarg);
ret = jshn_parse(optarg);
goto exit;
case 'R':
if ((fd = open(optarg, O_RDONLY)) == -1) {
fprintf(stderr, "Error opening %s\n", optarg);
return 3;
}
if (fstat(fd, &sb) == -1) {
fprintf(stderr, "Error getting size of %s\n", optarg);
close(fd);
return 3;
}
if (!(fbuf = malloc(sb.st_size))) {
fprintf(stderr, "Error allocating memory for %s\n", optarg);
close(fd);
return 3;
}
if (read(fd, fbuf, sb.st_size) != sb.st_size) {
fprintf(stderr, "Error reading %s\n", optarg);
free(fbuf);
close(fd);
return 3;
}
ret = jshn_parse(fbuf);
free(fbuf);
close(fd);
return ret;
ret = jshn_parse_file(optarg);
goto exit;
case 'w':
return jshn_format(no_newline, indent, stdout);
ret = jshn_format(no_newline, indent, stdout);
goto exit;
case 'o':
fp = fopen(optarg, "w");
if (!fp) {
fprintf(stderr, "Error opening %s\n", optarg);
return 3;
}
jshn_format(no_newline, indent, fp);
fclose(fp);
return 0;
ret = jshn_format_file(optarg, no_newline, indent);
goto exit;
case 'n':
no_newline = true;
break;
@ -421,5 +446,9 @@ int main(int argc, char **argv)
return usage(argv[0]);
}
}
return usage(argv[0]);
exit:
return ret;
}