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Full Discussion: String Constant C
Top Forums Programming String Constant C Post 302843764 by kris26 on Thursday 15th of August 2013 12:40:52 AM
Old 08-15-2013
String Constant C

I wonder string constant exists permanently or temporary.

For example,

printf("hello, world");

the function printf access to it is through a pointer. Does it mean storage is allocated for the string constant to exist permanently in memory? Smilie
 

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XrmUniqueQuark(3X11)													      XrmUniqueQuark(3X11)

NAME
XrmUniqueQuark, XrmStringToQuark, XrmPermStringToQuark, XrmQuarkToString, XrmStringToQuarkList, XrmStringToBindingQuarkList - manipulate resource quarks SYNOPSIS
XrmQuark XrmUniqueQuark() #define XrmStringToName(string) XrmStringToQuark(string) #define XrmStringToClass(string) XrmStringToQuark(string) #define XrmStringToRep- resentation(string) XrmStringToQuark(string) XrmQuark XrmStringToQuark(string) char *string; XrmQuark XrmPermStringToQuark(string) char *string; #define XrmStringToName(string) XrmStringToQuark(string) #define XrmStringToClass(string) XrmStringToQuark(string) #define XrmStringToRep- resentation(string) XrmStringToQuark(string) XrmQuark XrmStringToQuark(string) char *string; XrmQuark XrmPermStringToQuark(string) char *string; #define XrmNameToString(name) XrmQuarkToString(name) #define XrmClassToString(class) XrmQuarkToString(class) #define XrmRepresentation- ToString(type) XrmQuarkToString(type) char *XrmQuarkToString(quark) XrmQuark quark; #define XrmStringToNameList(str, name) XrmStringToQuarkList((str), (name)) #define XrmStringToClassList(str,class) XrmStringToQuark- List((str), (class)) void XrmStringToQuarkList(string, quarks_return) char *string; XrmQuarkList quarks_return; XrmStringToBindingQuarkList(string, bindings_return, quarks_return) char *string; XrmBindingList bindings_return; XrmQuarkList quarks_return; ARGUMENTS
Returns the binding list. Specifies the quark for which the equivalent string is desired. Returns the list of quarks. Specifies the string for which a quark or quark list is to be allocated. DESCRIPTION
The XrmUniqueQuark function allocates a quark that is guaranteed not to represent any string that is known to the resource manager. These functions can be used to convert from string to quark representation. If the string is not in the Host Portable Character Encoding, the conversion is implementation dependent. The string argument to XrmStringToQuark need not be permanently allocated storage. Xrm- PermStringToQuark is just like XrmStringToQuark, except that Xlib is permitted to assume the string argument is permanently allocated, and, hence, that it can be used as the value to be returned by XrmQuarkToString. For any given quark, if XrmStringToQuark returns a non-NULL value, all future calls will return the same value (identical address). These functions can be used to convert from quark representation to string. The string pointed to by the return value must not be modified or freed. The returned string is byte-for-byte equal to the original string passed to one of the string-to-quark routines. If no string exists for that quark, XrmQuarkToString returns NULL. For any given quark, if XrmQuarkToString returns a non-NULL value, all future calls will return the same value (identical address). These functions can be used to convert from string to quark representation. If the string is not in the Host Portable Character Encoding, the conversion is implementation dependent. The string argument to XrmStringToQuark need not be permanently allocated storage. Xrm- PermStringToQuark is just like XrmStringToQuark, except that Xlib is permitted to assume the string argument is permanently allocated, and, hence, that it can be used as the value to be returned by XrmQuarkToString. For any given quark, if XrmStringToQuark returns a non-NULL value, all future calls will return the same value (identical address). The XrmStringToQuarkList function converts the null-terminated string (generally a fully qualified name) to a list of quarks. Note that the string must be in the valid ResourceName format (see section 15.1). If the string is not in the Host Portable Character Encoding, the con- version is implementation dependent. A binding list is a list of type XrmBindingList and indicates if components of name or class lists are bound tightly or loosely (that is, if wildcarding of intermediate components is specified). typedef enum {XrmBindTightly, XrmBindLoosely} XrmBinding, *XrmBindingList; XrmBindTightly indicates that a period separates the components, and XrmBindLoosely indicates that an asterisk separates the components. The XrmStringToBindingQuarkList function converts the specified string to a binding list and a quark list. If the string is not in the Host Portable Character Encoding the conversion is implementation dependent. Component names in the list are separated by a period or an aster- isk character. If the string does not start with period or asterisk, a period is assumed. For example, "*a.b*c" becomes: quarks a b c bindings loose tight loose SEE ALSO
XrmGetResource(3X11), XrmInitialize(3X11), XrmMergeDatabases(3X11), XrmPutResource(3X11) Xlib -- C Language X Interface XrmUniqueQuark(3X11)
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