thodg/acme-client/jsmn.c

Branch - branch -currentmasterportable

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• Hash : 7ce919e1
  Author : Thomas de Grivel
  Date : 2025-09-13T18:56:04
  

  initial import from OpenBSD-current
  

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• jsmn.c

• /*
   Copyright (c) 2010 Serge A. Zaitsev
   
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
   
   The above copyright notice and this permission notice shall be included in
   all copies or substantial portions of the Software.
   
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   THE SOFTWARE.*
   */
  #include "jsmn.h"
  
  /**
   * Allocates a fresh unused token from the token pull.
   */
  static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
  		jsmntok_t *tokens, size_t num_tokens) {
  	jsmntok_t *tok;
  	if (parser->toknext >= num_tokens) {
  		return NULL;
  	}
  	tok = &tokens[parser->toknext++];
  	tok->start = tok->end = -1;
  	tok->size = 0;
  #ifdef JSMN_PARENT_LINKS
  	tok->parent = -1;
  #endif
  	return tok;
  }
  
  /**
   * Fills token type and boundaries.
   */
  static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
                              int start, int end) {
  	token->type = type;
  	token->start = start;
  	token->end = end;
  	token->size = 0;
  }
  
  /**
   * Fills next available token with JSON primitive.
   */
  static int jsmn_parse_primitive(jsmn_parser *parser, const char *js,
  		size_t len, jsmntok_t *tokens, size_t num_tokens) {
  	jsmntok_t *token;
  	int start;
  
  	start = parser->pos;
  
  	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
  		switch (js[parser->pos]) {
  #ifndef JSMN_STRICT
  			/* In strict mode primitive must be followed by "," or "}" or "]" */
  			case ':':
  #endif
  			case '\t' : case '\r' : case '\n' : case ' ' :
  			case ','  : case ']'  : case '}' :
  				goto found;
  		}
  		if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
  			parser->pos = start;
  			return JSMN_ERROR_INVAL;
  		}
  	}
  #ifdef JSMN_STRICT
  	/* In strict mode primitive must be followed by a comma/object/array */
  	parser->pos = start;
  	return JSMN_ERROR_PART;
  #endif
  
  found:
  	if (tokens == NULL) {
  		parser->pos--;
  		return 0;
  	}
  	token = jsmn_alloc_token(parser, tokens, num_tokens);
  	if (token == NULL) {
  		parser->pos = start;
  		return JSMN_ERROR_NOMEM;
  	}
  	jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
  #ifdef JSMN_PARENT_LINKS
  	token->parent = parser->toksuper;
  #endif
  	parser->pos--;
  	return 0;
  }
  
  /**
   * Fills next token with JSON string.
   */
  static int jsmn_parse_string(jsmn_parser *parser, const char *js,
  		size_t len, jsmntok_t *tokens, size_t num_tokens) {
  	jsmntok_t *token;
  
  	int start = parser->pos;
  
  	parser->pos++;
  
  	/* Skip starting quote */
  	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
  		char c = js[parser->pos];
  
  		/* Quote: end of string */
  		if (c == '\"') {
  			if (tokens == NULL) {
  				return 0;
  			}
  			token = jsmn_alloc_token(parser, tokens, num_tokens);
  			if (token == NULL) {
  				parser->pos = start;
  				return JSMN_ERROR_NOMEM;
  			}
  			jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos);
  #ifdef JSMN_PARENT_LINKS
  			token->parent = parser->toksuper;
  #endif
  			return 0;
  		}
  
  		/* Backslash: Quoted symbol expected */
  		if (c == '\\' && parser->pos + 1 < len) {
  			int i;
  			parser->pos++;
  			switch (js[parser->pos]) {
  				/* Allowed escaped symbols */
  				case '\"': case '/' : case '\\' : case 'b' :
  				case 'f' : case 'r' : case 'n'  : case 't' :
  					break;
  				/* Allows escaped symbol \uXXXX */
  				case 'u':
  					parser->pos++;
  					for(i = 0; i < 4 && parser->pos < len && js[parser->pos] != '\0'; i++) {
  						/* If it isn't a hex character we have an error */
  						if(!((js[parser->pos] >= 48 && js[parser->pos] <= 57) || /* 0-9 */
  									(js[parser->pos] >= 65 && js[parser->pos] <= 70) || /* A-F */
  									(js[parser->pos] >= 97 && js[parser->pos] <= 102))) { /* a-f */
  							parser->pos = start;
  							return JSMN_ERROR_INVAL;
  						}
  						parser->pos++;
  					}
  					parser->pos--;
  					break;
  				/* Unexpected symbol */
  				default:
  					parser->pos = start;
  					return JSMN_ERROR_INVAL;
  			}
  		}
  	}
  	parser->pos = start;
  	return JSMN_ERROR_PART;
  }
  
  /**
   * Parse JSON string and fill tokens.
   */
  int jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
  		jsmntok_t *tokens, unsigned int num_tokens) {
  	int r;
  	int i;
  	jsmntok_t *token;
  	int count = parser->toknext;
  
  	for (; parser->pos < len && js[parser->pos] != '\0'; parser->pos++) {
  		char c;
  		jsmntype_t type;
  
  		c = js[parser->pos];
  		switch (c) {
  			case '{': case '[':
  				count++;
  				if (tokens == NULL) {
  					break;
  				}
  				token = jsmn_alloc_token(parser, tokens, num_tokens);
  				if (token == NULL)
  					return JSMN_ERROR_NOMEM;
  				if (parser->toksuper != -1) {
  					tokens[parser->toksuper].size++;
  #ifdef JSMN_PARENT_LINKS
  					token->parent = parser->toksuper;
  #endif
  				}
  				token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
  				token->start = parser->pos;
  				parser->toksuper = parser->toknext - 1;
  				break;
  			case '}': case ']':
  				if (tokens == NULL)
  					break;
  				type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
  #ifdef JSMN_PARENT_LINKS
  				if (parser->toknext < 1) {
  					return JSMN_ERROR_INVAL;
  				}
  				token = &tokens[parser->toknext - 1];
  				for (;;) {
  					if (token->start != -1 && token->end == -1) {
  						if (token->type != type) {
  							return JSMN_ERROR_INVAL;
  						}
  						token->end = parser->pos + 1;
  						parser->toksuper = token->parent;
  						break;
  					}
  					if (token->parent == -1) {
  						break;
  					}
  					token = &tokens[token->parent];
  				}
  #else
  				for (i = parser->toknext - 1; i >= 0; i--) {
  					token = &tokens[i];
  					if (token->start != -1 && token->end == -1) {
  						if (token->type != type) {
  							return JSMN_ERROR_INVAL;
  						}
  						parser->toksuper = -1;
  						token->end = parser->pos + 1;
  						break;
  					}
  				}
  				/* Error if unmatched closing bracket */
  				if (i == -1) return JSMN_ERROR_INVAL;
  				for (; i >= 0; i--) {
  					token = &tokens[i];
  					if (token->start != -1 && token->end == -1) {
  						parser->toksuper = i;
  						break;
  					}
  				}
  #endif
  				break;
  			case '\"':
  				r = jsmn_parse_string(parser, js, len, tokens, num_tokens);
  				if (r < 0) return r;
  				count++;
  				if (parser->toksuper != -1 && tokens != NULL)
  					tokens[parser->toksuper].size++;
  				break;
  			case '\t' : case '\r' : case '\n' : case ' ':
  				break;
  			case ':':
  				parser->toksuper = parser->toknext - 1;
  				break;
  			case ',':
  				if (tokens != NULL && parser->toksuper != -1 &&
  						tokens[parser->toksuper].type != JSMN_ARRAY &&
  						tokens[parser->toksuper].type != JSMN_OBJECT) {
  #ifdef JSMN_PARENT_LINKS
  					parser->toksuper = tokens[parser->toksuper].parent;
  #else
  					for (i = parser->toknext - 1; i >= 0; i--) {
  						if (tokens[i].type == JSMN_ARRAY || tokens[i].type == JSMN_OBJECT) {
  							if (tokens[i].start != -1 && tokens[i].end == -1) {
  								parser->toksuper = i;
  								break;
  							}
  						}
  					}
  #endif
  				}
  				break;
  #ifdef JSMN_STRICT
  			/* In strict mode primitives are: numbers and booleans */
  			case '-': case '0': case '1' : case '2': case '3' : case '4':
  			case '5': case '6': case '7' : case '8': case '9':
  			case 't': case 'f': case 'n' :
  				/* And they must not be keys of the object */
  				if (tokens != NULL && parser->toksuper != -1) {
  					jsmntok_t *t = &tokens[parser->toksuper];
  					if (t->type == JSMN_OBJECT ||
  							(t->type == JSMN_STRING && t->size != 0)) {
  						return JSMN_ERROR_INVAL;
  					}
  				}
  #else
  			/* In non-strict mode every unquoted value is a primitive */
  			default:
  #endif
  				r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens);
  				if (r < 0) return r;
  				count++;
  				if (parser->toksuper != -1 && tokens != NULL)
  					tokens[parser->toksuper].size++;
  				break;
  
  #ifdef JSMN_STRICT
  			/* Unexpected char in strict mode */
  			default:
  				return JSMN_ERROR_INVAL;
  #endif
  		}
  	}
  
  	if (tokens != NULL) {
  		for (i = parser->toknext - 1; i >= 0; i--) {
  			/* Unmatched opened object or array */
  			if (tokens[i].start != -1 && tokens[i].end == -1) {
  				return JSMN_ERROR_PART;
  			}
  		}
  	}
  
  	return count;
  }
  
  /**
   * Creates a new parser based over a given  buffer with an array of tokens
   * available.
   */
  void jsmn_init(jsmn_parser *parser) {
  	parser->pos = 0;
  	parser->toknext = 0;
  	parser->toksuper = -1;
  }
  
  

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