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/*
File IO
Functions:
char *FReadNextLineAlloc(FILE *fp, char comment_char)
char *FReadNextLineAllocCount(
FILE *fp,
char comment_char,
int *line_count
)
---
*/
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include "../include/fio.h"
/*
* Allocate memory while reading a line from file in chunk size
* of this many bytes:
*/
#define FREAD_ALLOC_CHUNK_SIZE 8
/*
* Returns an allocated string containing the entire
* line or NULL on error or EOF.
*
* If comment_char is '\0' then the next line is read regardless
* if it is a comment or not.
*
* Calling function must free() the returned pointer.
*/
char *FReadNextLineAlloc(FILE *fp, char comment_char)
{
return(FReadNextLineAllocCount(fp, comment_char, NULL));
}
char *FReadNextLineAllocCount(
FILE *fp,
char comment_char,
int *line_count
)
{
int i, m, n;
char *strptr;
if(fp == NULL)
return(NULL);
/* Is comment character specified? */
if(comment_char != '\0')
{
/* Comment character is specified. */
/* Read past spaces, newlines, and comments. */
i = fgetc(fp);
if(i == EOF)
return(NULL);
while((i == ' ') || (i == '\t') || (i == '\n') || (i == '\r') ||
(i == comment_char)
)
{
if(i == EOF)
return(NULL);
/* If newline, then increment line count. */
if((i == '\n') ||
(i == '\r')
)
{
if(line_count != NULL)
*line_count += 1;
}
/* If comment, then skip to next line. */
if(i == comment_char)
{
i = fgetc(fp);
while((i != '\n') && (i != '\r'))
{
if(i == EOF)
return(NULL);
i = fgetc(fp);
}
if(line_count != NULL)
*line_count += 1;
}
/* Get next character. */
i = fgetc(fp);
}
/* Begin adding characters to string. */
m = 0; /* mem size. */
n = 1; /* chars read. */
strptr = NULL;
while((i != '\n') && (i != '\r') && (i != '\0'))
{
/* Escape character? */
if(i == '\\')
{
/* Read next character. */
i = fgetc(fp);
/* Skip newlines internally. */
if((i == '\n') || (i == '\r'))
{
i = fgetc(fp);
/* Still counts as a line though! */
if(line_count != NULL)
*line_count += 1;
}
}
if(i == EOF)
break;
/* Allocate more memory as needed. */
if(m < n)
{
/* Allocate FREAD_ALLOC_CHUNK_SIZE more bytes. */
m += FREAD_ALLOC_CHUNK_SIZE;
strptr = (char *)realloc(strptr, m * sizeof(char));
if(strptr == NULL)
return(NULL);
}
strptr[n - 1] = (char)i;
/* Read next character from file. */
i = fgetc(fp);
n++; /* Increment characters read. */
}
/* Add newline and null terminate. */
m += 2; /* 2 more chars. */
strptr = (char *)realloc(strptr, m * sizeof(char));
if(strptr == NULL)
return(NULL);
strptr[n - 1] = '\n';
strptr[n] = '\0';
/* Increment line count. */
if(line_count != NULL)
*line_count += 1;
}
else
{
/* Comment character is not specified. */
i = fgetc(fp);
if(i == EOF)
return(NULL);
/* Begin adding characters to string. */
m = 0; /* Memory size. */
n = 1; /* Characters read. */
strptr = NULL; /* Return string. */
while((i != '\n') && (i != '\r') && (i != '\0'))
{
/* Escape character? */
if(i == '\\')
{
/* Read next character. */
i = fgetc(fp);
/* Skip newlines internally. */
if((i == '\n') || (i == '\r'))
{
i = fgetc(fp);
/* Still counts as a line though! */
if(line_count != NULL)
*line_count += 1;
}
}
if(i == EOF)
break;
/* Allocate more memory as needed. */
if(m < n)
{
/* Allocate FREAD_ALLOC_CHUNK_SIZE more bytes. */
m += FREAD_ALLOC_CHUNK_SIZE;
strptr = (char *)realloc(strptr, m * sizeof(char));
if(strptr == NULL)
return(NULL);
}
strptr[n - 1] = (char)i;
/* Read next character from file. */
i = fgetc(fp);
n++; /* Increment characters read. */
}
/* Add newline and null terminate. */
m += 2; /* 2 more chars. */
strptr = (char *)realloc(strptr, m * sizeof(char));
strptr[n - 1] = '\n';
strptr[n] = '\0';
/* Increment line count. */
if(line_count != NULL)
*line_count += 1;
}
return(strptr);
}
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