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FishMarket 1.0
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FishMarket v1.0.iso
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disk_014
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dex
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dex2.c
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C/C++ Source or Header
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1992-05-06
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8KB
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423 lines
/************************************************************************
* *
* Copyright (c) 1982, Fred Fish *
* All Rights Reserved *
* *
* This software and/or documentation is released for public *
* distribution for personal, non-commercial use only. *
* Limited rights to use, modify, and redistribute are hereby *
* granted for non-commercial purposes, provided that all *
* copyright notices remain intact and all changes are clearly *
* documented. The author makes no warranty of any kind with *
* respect to this product and explicitly disclaims any implied *
* warranties of merchantability or fitness for any particular *
* purpose. *
* *
************************************************************************
*/
/*
* FILE
*
* dex2.c utility routines for DEX modules
*
* KEY WORDS
*
* dex files
* utility routines
*
* DESCRIPTION
*
* Contains miscellaneous utility routines which will
* eventually show up the the author's "ce" (C Environment)
* library, which supplements the stdio library.
*
* FUNCTIONS
*
* nextw return pointer to next word in a string
* skpnbt skip non-blanks and non-tabs
* skpbt skip blanks and tabs
* xfield extract next field from string
* index find first occurrence of character
* rindex find last occurrence of character
*
* AUTHOR
*
* Fred Fish
*
*/
#include <stdio.h>
/*
* FUNCTION
*
* NEXTW return pointer to next word in a string
*
* KEY WORDS
*
* string functions
* words
* nextw
* string pointers
*
* SYNOPSIS
*
* char *nextw(buffer)
* char *buffer;
*
* DESCRIPTION
*
* Nextw searches from the current pointer location for the
* next occurrence of <tab or space><non-tab and non-space>
* which is taken to be the start of a new word. If found,
* a pointer to the <non-tab and non-space> character is
* returned. If the end of the string is found, a pointer to it
* is returned.
*
* RETURNS
*
* Returns pointer to next word in buffer, if one is found.
* Returns pointer to terminating null if no word found.
*
* BUGS
*
* "Words" are taken to be anything which is neither tab nor
* blank. It might be hard to pronounce some of them.
* Also note that control characters (ie newline) preceded
* by tabs or blanks are also considered to be words.
*
*/
/*
* PSEUDO CODE
*
* Begin nextw
* Skip over any non-tabs and non-blanks.
* Skip over any tabs or blanks.
* Return resulting pointer to first char of word.
* End nextw
*
*/
char *nextw(buffer)
char *buffer;
{
char *skpbt(), *skpnbt();
buffer = skpnbt(buffer);
buffer = skpbt(buffer);
return (buffer);
}
/*
* FUNCTION
*
* skpnbt return pointer to next tab or blank character
*
* KEY WORDS
*
* string functions
* words
* skpnbt
* string pointers
*
* SYNOPSIS
*
* char *skpnbt(buffer)
* char *buffer;
*
* DESCRIPTION
*
* Starting at the current pointer, as long as a NULL is
* not encountered, skpnbt skips over anything which is not
* a blank or tab, returning a pointer to the first blank
* or tab found. If the end of the string is found first,
* a pointer to it is returned.
*
* RETURNS
*
* Returns pointer to next blank or tab character.
*
*/
/*
* PSEUDO CODE
*
* Begin skpnbt
* If passed point is not NULL then
* While the current char is not a tab, blank, or null
* Skip to next character.
* End while
* End if
* Return pointer to the character found.
* End skpnbt
*
*/
char *skpnbt(buffer)
char *buffer;
{
if (buffer != NULL) {
while (*buffer != '\t' && *buffer != ' ' && *buffer != '\n') {
buffer++;
}
}
return (buffer);
}
/*
* FUNCTION
*
* skpbt return pointer to next non-tab non-blank character
*
* KEY WORDS
*
* string functions
* words
* skpbt
* string pointers
*
* SYNOPSIS
*
* char *skpbt(buffer)
* char *buffer;
*
* DESCRIPTION
*
* Starting at the current pointer, skpbt skips over blanks
* and tabs, returning pointer to the first non-tab non-blank
* character found (which may be current).
*
* RETURNS
*
* Returns pointer to next non-tab and non-blank character.
*
*/
/*
* PSEUDO CODE
*
* Begin skpbt
* If pointer is not NULL then
* While the current character is a tab or blank
* Skip to next character.
* End while
* End if
* Return pointer to the character found.
* End skpbt
*
*/
char *skpbt(buffer)
char *buffer;
{
if (buffer != NULL) {
while (*buffer == '\t' || *buffer == ' ') {
buffer++;
}
}
return (buffer);
}
/*
* FUNCTION
*
* xfield extract a field from string
*
* SYNOPSIS
*
* char *xfield(out,in)
* char *out;
* char *in;
*
* DESCRIPTION
*
* Extracts field from a string up to next tab, blank,
* newline, or NULL character.
*
* If the field begins with a double quote then only another
* double quote or a NULL will terminate the extraction.
*
* RETURNS
*
* Returns pointer to next character not transfered, or "in"
* if no characters are transfered.
*
*/
/*
* PSEUDO CODE
*
* Begin xfield
* If both pointers are ok then
* If the field is quoted then
* Discard the leading quote.
* While end is not found
* Transfer characters.
* End while
* If terminating character is quote
* Discard the terminating quote.
* End if
* Terminate output string properly.
* Else
* While end is not found
* Transfer characters.
* End while
* Terminate output string properly.
* End if
* End if
* Return pointer to next input character.
* End xfield
*
*/
char *xfield(out,in)
char *out;
char *in;
{
if (out != NULL && in != NULL) {
if (*in == '"') {
in++;
while (*in != '"' && *in != NULL) {
*out++ = *in++;
}
if (*in == '"') {
in++;
}
*out = NULL;
} else {
while(*in != ' ' && *in != '\t' && *in != NULL && *in != '\n') {
*out++ = *in++;
}
*out = NULL;
}
}
return(in);
}
/*
* FUNCTION
*
* index return pointer to occurrence of a character
*
* KEY WORDS
*
* index
* character functions
*
* SYNOPSIS
*
* char *index(s,c)
* char *s;
* char c;
*
* DESCRIPTION
*
* Find first occurrence of a the specified character in
* the specified string.
*
* RETURNS
*
* Pointer to character if found.
* NULL if no occurrence found.
*
*/
/*
* PSEUDO CODE
*
* Begin index
* If string pointer valid then
* Scan for character or end of string.
* If end of string found then
* Return NULL.
* Else
* Return pointer.
* End if
* Else
* Return NULL.
* End if
* End index
*
*/
char *index(s,c)
char *s;
char c;
{
if (s != NULL) {
while (*s != NULL && *s != c) {s++;}
if (*s == NULL) {
return(NULL);
} else {
return(s);
}
} else {
return(NULL);
}
}
/*
* FUNCTION
*
* rindex return pointer to last occurrence of a character
*
* KEY WORDS
*
* string functions
* rindex
*
* SYNOPSIS
*
* char *rindex(s,c)
* string *s;
* char c;
*
* DESCRIPTION
*
* Find the last occurrence of the specified character in
* the specified string.
*
* RETURNS
*
* Pointer to last occurrence if character found.
* NULL if character not found.
*
*/
/*
* PSEUDO CODE
*
* Begin rindex
* Initialize return value to NULL.
* If string pointer is not invalid then
* For each character in string
* If character matches then
* Save pointer.
* End if
* End for
* End if
* Return pointer.
* End rindex
*
*/
char *rindex(s,c)
char *s;
char c;
{
char *rtn;
rtn = NULL;
if (s != NULL) {
for ( ; *s != NULL; *s++) {
if (*s == c) {
rtn = s;
}
}
}
return(rtn);
}