source: MondoRescue/branches/3.0/mondo/src/lib/mr_str.c@ 2972

/*
 * $Id$
 *
 * New generation of string handling functions safe from a memory management point of view 
 * Developped by Andree Leidenfrost
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>

#include "mr_mem.h"
 
/**
 * Safe alternative to standard function strtok()
 * @param instr
 * @param delims
 * @param lastpos
 * @return @p
 * @note this function allocates memory that needs to be freed by caller
 **/
char *mr_strtok(char *instr, const char *delims, int *lastpos)
{

    char *token = NULL;
    char *strptr = NULL;
    size_t pos1 = 0;
    size_t pos2 = 0;

    if (instr == NULL) {
        *lastpos = 0;
        return token;
    }

    if (delims == NULL) {
        *lastpos = 0;
        return token;
    }

    if (strlen(instr) <= *lastpos) {
        *lastpos = 0;
        return token;
    }

    strptr = instr + *lastpos;
    pos2 = strspn(strptr, delims);
    strptr += pos2;
    pos1 = strcspn(strptr, delims);
    token = (char *)mr_malloc(sizeof(*token) * (pos1 + 1));
    strncpy(token, strptr, pos1);
    token[pos1] = '\0';
    *lastpos = *lastpos + pos1 + pos2 + 1;

    return token;
}


/**
 * Returns the string fed to it 'inptr' with all characters to escape given
 * in 'toesc' prepended by escaping character 'escchr'.
 * (Prepare strings for use in system() or popen() with this function.)
 * @param instr
 * @param toesc
 * @param escchr
 * @note this function allocates memory that needs to be freed by caller
 **/
char *mr_stresc(char *instr, char *toesc, const char escchr) {
    char *inptr = NULL;
    char *retstr = NULL;
    char *retptr = NULL;
    char *escptr = NULL;
    int cnt = 0;

    inptr = instr;

    // Count how many characters need escaping.
    while (*inptr != '\0') {
        escptr = toesc;
        while (*escptr != '\0') {
            if (*inptr == *escptr) {
                // Found it, skip the rest.
                cnt++;
                break;
            }
            escptr++;
        }
        inptr++;
    }
    inptr = instr;

    retstr = (char *) mr_malloc(strlen(inptr) + cnt + 1);
    retptr = retstr;

    // Prepend specified characters with escape character.
    while (*inptr != '\0') {
        escptr = toesc;
        while (*escptr != '\0') {
            if (*inptr == *escptr) {
                // Found it, skip the rest.
                *retptr = escchr;
                retptr++;
                break;
            }
            escptr++;
        }
        *retptr = *inptr;
        retptr++;
        inptr++;
    }
    *retptr = '\0';

    return retstr;
}

/* Return a string containing the date */
char *mr_date(void) {
    
    time_t tcurr;

    tcurr = time(NULL);
    return(ctime(&tcurr));
}


/**
 * Remove all characters whose ASCII value is less than or equal to 32
 * (spaces and control characters) from both sides of @p in_out.
 * @param in_out The string to strip spaces/control characters from (modified).
 */
void mr_strip_spaces(char *in_out) {
    int i = 0;
    int j = 0;
    size_t length;

    if (in_out == NULL) {
        return;
    }
    length = strlen(in_out);

    /* Skip initial spaces and special chars */
    for (i = 0; in_out[i] <= ' ' && i < (int)length ; i++);
    /* Shift the string to the begining if needed */
    if (i != 0) {
        for (j = 0; i < (int)length ; i++, j++) {
            in_out[j] = in_out[i];
        }
        /* Erase the end of the string if needed */
        j++;
        in_out[j] = '\0';
    }

    /* Skip final spaces and special chars */
    for (i = (int)strlen(in_out) - 1; i >= 0  && in_out[i] <= ' '; i--);

    /* The string now ends after that char */
    i++;
    in_out[i] = '\0';
}