aisl-sdk/components/validate.c

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