115 lines
1.8 KiB
C
115 lines
1.8 KiB
C
/******************************************************************************
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*
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* Copyright (c) 2017-2019 by Löwenware Ltd
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* Please, refer LICENSE file for legal information
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*
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******************************************************************************/
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/**
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* @file validate.c
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* @author Ilja Kartašov <ik@lowenware.com>
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* @brief Validation component source file
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*
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* @see https://lowenware.com/aisl/
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*/
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#include <ctype.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "validate.h"
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int
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ax_validate_email(const char *value)
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{
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const char *at = NULL,
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*dot = NULL,
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*i = value;
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char c;
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while ( (c = *i) != 0 ) {
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switch(c) {
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case '@':
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if (at || i == value)
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break;
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at = i++;
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dot = NULL;
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continue;
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case '"':
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case '(':
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case ')':
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case ',':
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case ';':
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case ':':
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case '<':
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case '>':
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case '[':
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case '\\':
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case ']':
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case ' ':
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/* These characters are allowed in double quotes only, but it is not
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* implemented in this validator, so we count them as forbidden
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*/
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break;
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case '!':
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case '#':
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case '$':
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case '%':
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case '&':
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case '\'':
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case '*':
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case '+':
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case '/':
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case '=':
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case '?':
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case '^':
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case '_':
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case '`':
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case '{':
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case '|':
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case '}':
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case '~':
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/* Allowed special local-part characters */
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if (!at) {
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i++;
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continue;
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}
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break;
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case '-':
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/* Allowed characters */
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i++;
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continue;
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case '.':
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if (dot && i == dot+1)
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break;
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if (at) {
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if (i == at+1 || *(i+1) == 0)
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break;
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} else {
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if (i == value || *(i+1) == '@')
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break;
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}
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dot = i++;
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continue;
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default:
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if ( isalnum(c) == 0 )
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continue;
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break;
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}
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return (int)(i-value)+1;
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}
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if (!at || !dot)
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return -1;
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return 0;
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}
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