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/**
* @file gensvm_strutil.c
* @author Gertjan van den Burg
* @date January, 2014
* @brief Utility functions for dealing with strings
*
* @details
* This file contains functions for reading files, reading strings from a
* format and checking start and ends of strings.
*/
#include "gensvm_strutil.h"
#include "gensvm_print.h"
/**
* @brief Check if a string starts with a prefix
*
* @param[in] str string
* @param[in] pre prefix
* @returns boolean, true if string starts with prefix, false
* otherwise
*/
bool str_startswith(const char *str, const char *pre)
{
size_t lenpre = strlen(pre),
lenstr = strlen(str);
return lenstr < lenpre ? false : strncmp(pre, str, lenpre) == 0;
}
/**
* @brief Check if a string ends with a suffix
*
* @param[in] str string
* @param[in] suf suffix
* @returns boolean, true if string ends with suffix, false
* otherwise
*/
bool str_endswith(const char *str, const char *suf)
{
size_t lensuf = strlen(suf),
lenstr = strlen(str);
return lenstr < lensuf ? false : strncmp(str + lenstr - lensuf, suf,
lensuf) == 0;
}
/**
* @brief Move to next line in file
*
* @param[in] fid File opened for reading
* @param[in] filename name of the file pointed to by fid
*/
void next_line(FILE *fid, char *filename)
{
char buffer[MAX_LINE_LENGTH];
get_line(fid, filename, buffer);
}
/**
* @brief Read line to buffer
*
* @param[in] fid File opened for reading
* @param[in] filename name of the file
* @param[in,out] buffer allocated buffer to read to
*/
char *get_line(FILE *fid, char *filename, char *buffer)
{
char *retval = fgets(buffer, MAX_LINE_LENGTH, fid);
if (retval == NULL) {
err("[GenSVM Error]: Error reading from file %s\n", filename);
}
return retval;
}
/**
* @brief Read a double from file following a format
*
* @details
* This function reads a double value from a file. If no value can be found, a
* warning is printed to stderr, and NAN is returned.
*
* @param[in] fid File opened for reading
* @param[in] filename Name of the file
* @param[in] fmt Format containing a float format
* @returns value read (if any)
*/
double get_fmt_double(FILE *fid, char *filename, const char *fmt)
{
char buffer[MAX_LINE_LENGTH];
double value = NAN;
int retval;
get_line(fid, filename, buffer);
retval = sscanf(buffer, fmt, &value);
if (retval == 0)
err("[GenSVM Error]: No double read from file.\n");
return value;
}
/**
* @brief Read a long integer from file following a format
*
* @param[in] fid File opened for reading
* @param[in] filename Name of the file
* @param[in] fmt Format containing a long integer format
* @returns value read (if any)
*/
long get_fmt_long(FILE *fid, char *filename, const char *fmt)
{
char buffer[MAX_LINE_LENGTH];
long value = 0;
int retval;
get_line(fid, filename, buffer);
retval = sscanf(buffer, fmt, &value);
if (retval == 0)
err("[GenSVM Error]: No long read from file.\n");
return value;
}
/**
* @brief Read all doubles in a given buffer
*
* @details
* This function is used to read a line of doubles from a buffer. All the
* doubles found are stored in a pre-allocated array.
*
* @param[in] buffer a string buffer
* @param[in] offset an offset of the string to start looking for
* doubles
* @param[in] all_doubles pre-allocated array of doubles (should be large
* enough)
* @returns number of doubles read
*/
long all_doubles_str(char *buffer, long offset, double *all_doubles)
{
double value;
long i = 0;
char *start = NULL,
*end = NULL;
start = buffer + offset;
while (true) {
value = strtod(start, &end);
if (start != end) {
all_doubles[i] = value;
i++;
} else
break;
start = end;
end = NULL;
}
return i;
}
/**
* @brief Read all longs in a given buffer
*
* @details
* This function is used to read a line of longs from a buffer. All the
* longs found are stored in a pre-allocated array.
*
* @param[in] buffer a string buffer
* @param[in] offset an offset of the string to start looking for
* longs
* @param[in] all_longs pre-allocated array of longs (should be large
* enough)
* @returns number of longs read
*/
long all_longs_str(char *buffer, long offset, long *all_longs)
{
long value;
long i = 0;
char *start = NULL,
*end = NULL;
start = buffer + offset;
while (true) {
value = strtol(start, &end, 10);
if (start != end) {
all_longs[i] = value;
i++;
} else
break;
start = end;
end = NULL;
}
return i;
}
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