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libkernaux
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Rewrite command line parser

This commit is contained in:
Alex Kotov 2020-12-04 07:41:45 +05:00
parent 93e764c1b8
commit 76bcd5a732
Signed by: kotovalexarian
GPG Key ID: 553C0EBBEB5D5F08
1 changed files with 60 additions and 9 deletions
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69
src/cmdline.c
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@ -2,6 +2,13 @@
#include <kernaux/cmdline.h>
enum State {
INITIAL,
FINAL,
WHITESPACE,
TOKEN,
};
kernaux_bool kernaux_cmdline_parse(
const char *const cmdline,
char *error_msg,
@ -35,13 +42,61 @@ kernaux_bool kernaux_cmdline_parse(
return KERNAUX_TRUE;
}
enum State state = INITIAL;
unsigned int start = 0;
for (unsigned int index = 1; ; ++index) {
const char prev = cmdline[index - 1];
const char cur = cmdline[index];
for (unsigned int index = 0; ; ++index) {
const char cur = cmdline[index];
if ((cur == ' ' || cur == '\0') && prev != ' ') {
switch (state) {
case FINAL:
break; // Case break; loop break after switch.
case INITIAL:
if (cur == '\0') {
state = FINAL;
}
else if (cur == ' ') {
state = WHITESPACE;
}
else {
state = TOKEN;
start = index;
}
break;
case WHITESPACE:
if (cur == '\0') {
state = FINAL;
}
else if (cur == ' ') {
}
else {
state = TOKEN;
start = index;
}
break;
case TOKEN:
if (cur == '\0') {
state = FINAL;
goto create_token;
}
else if (cur == ' ') {
state = WHITESPACE;
goto create_token;
}
else {
}
break;
}
if (state == FINAL) {
break;
}
continue;
create_token:
{
const unsigned size = index - start + 1;
if (*argc >= argv_count_max) {
@ -59,11 +114,7 @@ kernaux_bool kernaux_cmdline_parse(
buffer += size;
}
if (prev == ' ' && cur != ' ' && cur != '\0') {
start = index;
}
if (cur == '\0') {
if (state == FINAL) {
break;
}
}