source: branches/stable/mondo/src/lib/mr_str.c @ 1594

Last change on this file since 1594 was 1594, checked in by Bruno Cornec, 13 years ago

Use of conf file entries (iso_burning_*, media_device, media_size)
and adapatation of the rest of the code to that (including bkpinfo)

  • Property svn:eol-style set to native
File size: 3.0 KB
Line 
1/*
2 * $Id$
3 *
4 * New generation of string handling functions safe from a memory management point of view
5 * Developped by Andree Leidenfrost
6 */
7
8#include <stdio.h>
9#include <string.h>
10#include <time.h>
11
12#include "mr_mem.h"
13 
14/**
15 * Safe alternative to standard function strtok()
16 * @param instr
17 * @param delims
18 * @param lastpos
19 * @return @p
20 * @note this function allocates memory that needs to be freed by caller
21 **/
22char *mr_strtok(char *instr, const char *delims, int *lastpos)
23{
24
25    char *token = NULL;
26    char *strptr = NULL;
27    size_t pos1 = 0;
28    size_t pos2 = 0;
29
30    if (strlen(instr) <= *lastpos) {
31        *lastpos = 0;
32        return token;
33    }
34
35    strptr = instr + *lastpos;
36    pos2 = strspn(strptr, delims);
37    strptr += pos2;
38    pos1 = strcspn(strptr, delims);
39    token = (char *)mr_malloc(sizeof(*token) * (pos1 + 1));
40    strncpy(token, strptr, pos1);
41    token[pos1] = '\0';
42    *lastpos = *lastpos + pos1 + pos2 + 1;
43
44    return token;
45}
46
47
48/**
49 * Returns the string fed to it 'inptr' with all characters to escape given
50 * in 'toesc' prepended by escaping character 'escchr'.
51 * (Prepare strings for use in system() or popen() with this function.)
52 * @param instr
53 * @param toesc
54 * @param escchr
55 * @note this function allocates memory that needs to be freed by caller
56 **/
57char *mr_stresc(char *instr, char *toesc, const char escchr) {
58    char *inptr = NULL;
59    char *retstr = NULL;
60    char *retptr = NULL;
61    char *escptr = NULL;
62    int cnt = 0;
63
64    inptr = instr;
65
66    // Count how many characters need escaping.
67    while (*inptr != '\0') {
68        escptr = toesc;
69        while (*escptr != '\0') {
70            if (*inptr == *escptr) {
71                // Found it, skip the rest.
72                cnt++;
73                break;
74            }
75            escptr++;
76        }
77        inptr++;
78    }
79    inptr = instr;
80
81    retstr = (char *) mr_malloc(strlen(inptr) + cnt + 1);
82    retptr = retstr;
83
84    // Prepend specified characters with escape character.
85    while (*inptr != '\0') {
86        escptr = toesc;
87        while (*escptr != '\0') {
88            if (*inptr == *escptr) {
89                // Found it, skip the rest.
90                *retptr = escchr;
91                retptr++;
92                break;
93            }
94            escptr++;
95        }
96        *retptr = *inptr;
97        retptr++;
98        inptr++;
99    }
100    *retptr = '\0';
101
102    return retstr;
103}
104
105/* Return a string containing the date */
106char *mr_date(void) {
107   
108    time_t tcurr;
109
110    tcurr = time(NULL);
111    return(ctime(&tcurr));
112}
113
114
115/**
116 * Remove all characters whose ASCII value is less than or equal to 32
117 * (spaces and control characters) from both sides of @p in_out.
118 * @param in_out The string to strip spaces/control characters from (modified).
119 */
120void mr_strip_spaces(char *in_out) {
121    int i = 0;
122    int j = 0;
123    size_t length;
124
125    if (in_out == NULL) {
126        return;
127    }
128    length = strlen(in_out);
129
130    /* Skip initial spaces and special chars */
131    for (i = 0; in_out[i] <= ' ' && i < (int)length ; i++);
132    /* Shift the string to the begining if needed */
133    if (i != 0) {
134        for (j = 0; i < (int)length ; i++, j++) {
135            in_out[j] = in_out[i];
136        }
137        /* Erase the end of the string if needed */
138        j++;
139        in_out[j] = '\0';
140    }
141
142    /* Skip final spaces and special chars */
143    for (i = (int)strlen(in_out) - 1; i >= 0  && in_out[i] <= ' '; i--);
144
145    /* The string now ends after that char */
146    i++;
147    in_out[i] = '\0';
148}
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