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Optionally read from stdin

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This commit is contained in:
akp 2023-10-08 19:01:34 +01:00
parent e514846c98
commit 087ac26c84
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GPG key ID: CF8D58F3DEB20755
1 changed files with 18 additions and 8 deletions
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26
firewall-rules/parser.c
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@ -40,7 +40,7 @@ char* parse_ip(char* startptr, struct IP* ip) {
return endptr;
}
// parse_ip parses a port starting at startptr. Returns the ending position of the pointer in line.
// parse_port parses a port starting at startptr. Returns the ending position of the pointer in line.
// Returns NULL on failure.
char* parse_port(char* startptr, Port* port) {
char* end;
@ -153,10 +153,18 @@ char* parse_rule(char line[], struct Rule* result) {
// by the return value should be freed by the caller. If the return value is
// NULL, an error was encoutered and echo'd.
struct Rule** parse_file(char fname[], size_t* num_parsed_rules) {
FILE *fp = fopen(fname, "r");
if (fp == NULL) {
perror("Read input file");
return NULL;
int is_stdin = strcmp(fname, "--") == 0;
FILE *fp = NULL;
if (is_stdin == 1) {
fp = stdin;
} else {
fp = fopen(fname, "r");
if (fp == NULL) {
perror("Read input file");
return NULL;
}
}
struct Rule** parsed_rules = malloc(sizeof(struct Rule*) * MAX_RULES);
@ -185,9 +193,11 @@ struct Rule** parse_file(char fname[], size_t* num_parsed_rules) {
}
free(line);
if (fclose(fp) != 0) {
perror("Close input file");
return NULL;
if (is_stdin != 1) {
if (fclose(fp) != 0) {
perror("Close input file");
return NULL;
}
}
return parsed_rules;