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/**
* @file misc.c
* @author Joe Wingbermuehle
* @date 2004-2006
*
* @brief Miscellaneous functions and macros.
*
*/
#include "jwm.h"
#include "misc.h"
static int IsSpace(char ch);
static int IsSymbolic(char ch);
static char *GetSymbolName(const char *str);
static void ReplaceSymbol(char **str, const char *name, const char *value);
/** Determine if a character is a space character. */
int IsSpace(char ch) {
switch(ch) {
case ' ':
case '\t':
case '\n':
case '\r':
return 1;
default:
return 0;
}
}
/** Determine if a character is a valid for a shell variable. */
int IsSymbolic(char ch) {
if(ch >= 'A' && ch <= 'Z') {
return 1;
} else if(ch >= 'a' && ch <= 'z') {
return 1;
} else if(ch >= '0' && ch <= '9') {
return 1;
} else if(ch == '_') {
return 1;
} else {
return 0;
}
}
/** Get the name of a shell variable (returns a copy). */
char *GetSymbolName(const char *str) {
char *temp;
int stop;
if(*str == '$') {
temp = Allocate(2);
temp[0] = '$';
temp[1] = 0;
} else {
for(stop = 0; IsSymbolic(str[stop]); stop++);
temp = Allocate(stop + 1);
memcpy(temp, str, stop);
temp[stop] = 0;
}
return temp;
}
/** Replace "name" with "value" in str (reallocates if needed). */
void ReplaceSymbol(char **str, const char *name, const char *value) {
char *temp;
int strLength;
int nameLength;
int valueLength;
int x;
Assert(str);
Assert(name);
strLength = strlen(*str);
nameLength = strlen(name) + 1;
if(value) {
valueLength = strlen(value);
} else {
valueLength = 0;
}
if(valueLength > nameLength) {
temp = Allocate(strLength - nameLength + valueLength + 1);
strcpy(temp, *str);
Release(*str);
*str = temp;
}
temp = strstr(*str, name);
Assert(temp);
--temp; /* Account for the "$" */
if(nameLength > valueLength) {
/* Move left */
for(x = 0; temp[x]; x++) {
temp[x] = temp[x + nameLength - valueLength];
}
temp[x] = temp[x + nameLength - valueLength];
} else if(nameLength < valueLength) {
/* Move right */
for(x = strlen(temp); x >= 0; x--) {
temp[x + valueLength - nameLength] = temp[x];
}
}
if(value) {
memcpy(temp, value, valueLength);
}
}
/** Perform shell-like macro path expansion. */
void ExpandPath(char **path) {
char *name;
char *value;
int x;
Assert(path);
for(x = 0; (*path)[x]; x++) {
if((*path)[x] == '$') {
name = GetSymbolName(*path + x + 1);
value = getenv(name);
ReplaceSymbol(path, name, value);
Release(name);
if(value) {
x += strlen(value) - 1;
}
}
}
}
/** Trim leading and trailing whitespace from a string. */
void Trim(char *str) {
int length;
int start;
int x;
Assert(str);
length = strlen(str);
/* Determine how much to cut off of the left. */
for(start = 0; IsSpace(str[start]); start++);
/* Trim the left. */
if(start > 0) {
length -= start;
for(x = 0; x < length + 1; x++) {
str[x] = str[x + start];
}
}
/* Trim the right. */
while(IsSpace(str[length - 1])) {
--length;
str[length] = 0;
}
}
/** Copy a string. */
char *CopyString(const char *str) {
char *temp;
int len;
if(!str) {
return NULL;
}
len = strlen(str) + 1;
temp = Allocate(len);
memcpy(temp, str, len);
return temp;
}
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