mirror of
https://github.com/michaelrsweet/mxml.git
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308 lines
6.7 KiB
C
308 lines
6.7 KiB
C
/*
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* Attribute support code for Mini-XML, a small XML file parsing library.
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*
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* Copyright 2003-2017 by Michael R Sweet.
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*
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* These coded instructions, statements, and computer programs are the
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* property of Michael R Sweet and are protected by Federal copyright
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* law. Distribution and use rights are outlined in the file "COPYING"
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* which should have been included with this file. If this file is
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* missing or damaged, see the license at:
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*
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* https://michaelrsweet.github.io/mxml
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*/
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/*
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* Include necessary headers...
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*/
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#include "config.h"
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#include "mxml.h"
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/*
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* Local functions...
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*/
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static int mxml_set_attr(mxml_node_t *node, const char *name,
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char *value);
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/*
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* 'mxmlElementDeleteAttr()' - Delete an attribute.
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*
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* @since Mini-XML 2.4@
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*/
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void
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mxmlElementDeleteAttr(mxml_node_t *node,/* I - Element */
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const char *name)/* I - Attribute name */
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{
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int i; /* Looping var */
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mxml_attr_t *attr; /* Cirrent attribute */
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#ifdef DEBUG
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fprintf(stderr, "mxmlElementDeleteAttr(node=%p, name=\"%s\")\n",
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node, name ? name : "(null)");
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#endif /* DEBUG */
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/*
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* Range check input...
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*/
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if (!node || node->type != MXML_ELEMENT || !name)
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return;
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/*
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* Look for the attribute...
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*/
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for (i = node->value.element.num_attrs, attr = node->value.element.attrs;
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i > 0;
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i --, attr ++)
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{
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#ifdef DEBUG
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printf(" %s=\"%s\"\n", attr->name, attr->value);
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#endif /* DEBUG */
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if (!strcmp(attr->name, name))
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{
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/*
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* Delete this attribute...
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*/
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free(attr->name);
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free(attr->value);
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i --;
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if (i > 0)
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memmove(attr, attr + 1, i * sizeof(mxml_attr_t));
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node->value.element.num_attrs --;
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if (node->value.element.num_attrs == 0)
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free(node->value.element.attrs);
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return;
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}
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}
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}
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/*
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* 'mxmlElementGetAttr()' - Get an attribute.
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*
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* This function returns NULL if the node is not an element or the
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* named attribute does not exist.
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*/
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const char * /* O - Attribute value or NULL */
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mxmlElementGetAttr(mxml_node_t *node, /* I - Element node */
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const char *name) /* I - Name of attribute */
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{
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int i; /* Looping var */
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mxml_attr_t *attr; /* Cirrent attribute */
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#ifdef DEBUG
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fprintf(stderr, "mxmlElementGetAttr(node=%p, name=\"%s\")\n",
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node, name ? name : "(null)");
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#endif /* DEBUG */
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/*
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* Range check input...
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*/
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if (!node || node->type != MXML_ELEMENT || !name)
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return (NULL);
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/*
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* Look for the attribute...
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*/
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for (i = node->value.element.num_attrs, attr = node->value.element.attrs;
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i > 0;
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i --, attr ++)
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{
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#ifdef DEBUG
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printf(" %s=\"%s\"\n", attr->name, attr->value);
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#endif /* DEBUG */
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if (!strcmp(attr->name, name))
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{
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#ifdef DEBUG
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printf(" Returning \"%s\"!\n", attr->value);
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#endif /* DEBUG */
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return (attr->value);
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}
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}
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/*
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* Didn't find attribute, so return NULL...
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*/
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#ifdef DEBUG
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puts(" Returning NULL!\n");
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#endif /* DEBUG */
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return (NULL);
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}
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/*
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* 'mxmlElementSetAttr()' - Set an attribute.
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*
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* If the named attribute already exists, the value of the attribute
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* is replaced by the new string value. The string value is copied
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* into the element node. This function does nothing if the node is
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* not an element.
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*/
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void
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mxmlElementSetAttr(mxml_node_t *node, /* I - Element node */
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const char *name, /* I - Name of attribute */
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const char *value) /* I - Attribute value */
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{
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char *valuec; /* Copy of value */
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#ifdef DEBUG
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fprintf(stderr, "mxmlElementSetAttr(node=%p, name=\"%s\", value=\"%s\")\n",
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node, name ? name : "(null)", value ? value : "(null)");
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#endif /* DEBUG */
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/*
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* Range check input...
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*/
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if (!node || node->type != MXML_ELEMENT || !name)
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return;
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if (value)
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valuec = strdup(value);
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else
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valuec = NULL;
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if (mxml_set_attr(node, name, valuec))
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free(valuec);
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}
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/*
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* 'mxmlElementSetAttrf()' - Set an attribute with a formatted value.
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*
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* If the named attribute already exists, the value of the attribute
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* is replaced by the new formatted string. The formatted string value is
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* copied into the element node. This function does nothing if the node
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* is not an element.
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*
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* @since Mini-XML 2.3@
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*/
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void
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mxmlElementSetAttrf(mxml_node_t *node, /* I - Element node */
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const char *name, /* I - Name of attribute */
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const char *format,/* I - Printf-style attribute value */
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...) /* I - Additional arguments as needed */
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{
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va_list ap; /* Argument pointer */
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char *value; /* Value */
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#ifdef DEBUG
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fprintf(stderr,
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"mxmlElementSetAttrf(node=%p, name=\"%s\", format=\"%s\", ...)\n",
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node, name ? name : "(null)", format ? format : "(null)");
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#endif /* DEBUG */
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/*
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* Range check input...
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*/
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if (!node || node->type != MXML_ELEMENT || !name || !format)
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return;
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/*
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* Format the value...
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*/
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va_start(ap, format);
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value = _mxml_vstrdupf(format, ap);
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va_end(ap);
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if (!value)
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mxml_error("Unable to allocate memory for attribute '%s' in element %s!",
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name, node->value.element.name);
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else if (mxml_set_attr(node, name, value))
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free(value);
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}
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/*
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* 'mxml_set_attr()' - Set or add an attribute name/value pair.
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*/
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static int /* O - 0 on success, -1 on failure */
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mxml_set_attr(mxml_node_t *node, /* I - Element node */
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const char *name, /* I - Attribute name */
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char *value) /* I - Attribute value */
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{
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int i; /* Looping var */
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mxml_attr_t *attr; /* New attribute */
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/*
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* Look for the attribute...
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*/
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for (i = node->value.element.num_attrs, attr = node->value.element.attrs;
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i > 0;
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i --, attr ++)
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if (!strcmp(attr->name, name))
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{
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/*
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* Free the old value as needed...
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*/
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if (attr->value)
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free(attr->value);
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attr->value = value;
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return (0);
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}
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/*
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* Add a new attribute...
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*/
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if (node->value.element.num_attrs == 0)
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attr = malloc(sizeof(mxml_attr_t));
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else
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attr = realloc(node->value.element.attrs,
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(node->value.element.num_attrs + 1) * sizeof(mxml_attr_t));
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if (!attr)
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{
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mxml_error("Unable to allocate memory for attribute '%s' in element %s!",
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name, node->value.element.name);
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return (-1);
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}
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node->value.element.attrs = attr;
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attr += node->value.element.num_attrs;
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if ((attr->name = strdup(name)) == NULL)
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{
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mxml_error("Unable to allocate memory for attribute '%s' in element %s!",
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name, node->value.element.name);
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return (-1);
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}
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attr->value = value;
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node->value.element.num_attrs ++;
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return (0);
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}
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