kargs.c

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#include <core/system.h>
#include <core/string.h>
#include <core/kargs.h>
#include <aquila/errno.h>
 
/* The most arguments that are kept; the rest are ignored. */
#define MAX_ARGS 128
 
static struct {
    const char *key;
    const char *value;
} kargs[MAX_ARGS];
 
static int kargc;

int kargs_parse(const char *_cmdline)
{
    printk("kernel: cmdline: %s\n", _cmdline);
 
    if (!_cmdline || !*_cmdline)
        return 0;
 
    char **tokens = tokenize(_cmdline, ' ');
 
    /* no memory for the arguments: the kernel goes on without them */
    if (!tokens)
        return -ENOMEM;
 
    for (char **token_p = tokens; *token_p && kargc < MAX_ARGS; ++token_p) {
        char *token = *token_p;
 
        kargs[kargc].key   = token;
        kargs[kargc].value = NULL;
 
        /* split on the first '=' only: the value may contain '=' too */
        for (char *c = token; *c; ++c) {
            if (*c == '=') {
                *c = 0;
                kargs[kargc].value = c + 1;
                break;
            }
        }
 
        ++kargc;
    }
 
    return kargc;
}

int kargs_get(const char *key, const char **value)
{
    for (int i = 0; i < kargc; ++i) {
        if (!strcmp(kargs[i].key, key)) {
            if (value)
                *value = kargs[i].value;
 
            return 0;
        }
    }
 
    return -1;
}