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json.c
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121 lines (116 loc) · 2.06 KB
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#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "json.h"
int json_ws(char *json)
{
char *s = json;
while (*s == ' ' || *s == '\t' || *s == '\n' || *s == '\r')
s++;
return s - json;
}
int json_len(char *json)
{
char *s = json;
s += json_ws(s);
if (*s == '"') {
for (s++; *s && *s != '"'; s++)
if (*s == '\\')
s++;
return *s == '"' ? s - json + 1 : s - json;
}
if (*s == '[') {
s += json_ws(s + 1) + 1;
while (*s && *s != ']') {
s += json_len(s);
s += json_ws(s);
if (*s != ',')
break;
s += json_ws(s + 1) + 1;
}
return *s == ']' ? s - json + 1 : s - json;
}
if (*s == '{') {
s += json_ws(s + 1) + 1;
while (*s && *s != '}') {
s += json_len(s);
s += json_ws(s);
if (*s != ':')
break;
s += json_len(s + 1) + 1;
s += json_ws(s);
if (*s != ',')
break;
s += json_ws(s + 1) + 1;
}
return *s == '}' ? s - json + 1 : s - json;
}
if (isalnum((unsigned char) *s)) {
while (isalnum((unsigned char) *s))
s++;
return s - json;
}
return 0;
}
char *json_list(char *json, int key)
{
char *s = json;
int i = 0;
if (*s != '[')
return NULL;
s += json_ws(s + 1) + 1;
while (*s && *s != ']') {
s += json_ws(s);
if (i++ == key)
return s;
s += json_len(s);
s += json_ws(s);
if (*s != ',')
return NULL;
s += json_ws(s + 1) + 1;
}
return NULL;
}
int json_str(char *json, char *dst, int len)
{
if (!json)
return -1;
json += json_ws(json);
if (*json != '"')
return -1;
json++;
while (*json != '"' && len > 1) {
if (*json == '\\' && json[1])
json++;
*dst++ = *json++;
len--;
}
*dst = '\0';
return 0;
}
char *json_dict(char *json, char *key)
{
char *s = json;
char cur[256];
if (*s != '{')
return NULL;
s += json_ws(s + 1) + 1;
while (*s && *s != '}') {
if (json_str(s, cur, sizeof(cur)))
break;
s += json_len(s);
s += json_ws(s);
if (*s != ':')
return NULL;
s += json_ws(s + 1) + 1;
if (!strcmp(cur, key))
return s;
s += json_len(s);
s += json_ws(s);
if (*s != ',')
break;
s += json_ws(s + 1) + 1;
}
return NULL;
}