1 | /*
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2 | * mr_string.c - New generation of string handling functions
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3 | */
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4 |
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5 | #include <stdlib.h>
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6 | #include <stdio.h>
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7 | #include <string.h>
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8 |
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9 | /**
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10 | * Safe alternative to standard function strok()
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11 | * @param instr
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12 | * @param delims
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13 | * @param lastpos
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14 | * @return @p
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15 | * @note this function allocates memory that needs to be freed by caller
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16 | **/
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17 | char *mr_strtok(char *instr, const char *delims, int *lastpos)
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18 | {
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19 |
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20 | char *token = NULL;
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21 | char *strptr = NULL;
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22 | size_t pos1 = 0;
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23 | size_t pos2 = 0;
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24 |
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25 | if (strlen(instr) <= *lastpos) {
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26 | *lastpos = 0;
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27 | return token;
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28 | }
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29 |
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30 | strptr = instr + *lastpos;
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31 | pos2 = strspn(strptr, delims);
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32 | strptr += pos2;
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33 | pos1 = strcspn(strptr, delims);
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34 | token = malloc(sizeof(*token) * (pos1 + 1));
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35 | strncpy(token, strptr, pos1);
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36 | token[pos1] = '\0';
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37 | *lastpos = *lastpos + pos1 + pos2 + 1;
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38 |
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39 | return token;
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40 | }
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41 |
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42 |
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43 | /**
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44 | * Returns the string fed to it 'inptr' with all characters to escape given
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45 | * in 'toesc' prepended by escaping character 'escchr'.
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46 | * (Prepare strings for use in system() or popen() with this function.)
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47 | * @param instr
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48 | * @param toesc
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49 | * @param escchr
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50 | * @note this function allocates memory that needs to be freed by caller
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51 | **/
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52 | char *mr_stresc(char *instr, char *toesc, const char escchr)
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53 | {
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54 |
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55 | char *inptr = NULL;
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56 | char *retstr = NULL;
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57 | char *retptr = NULL;
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58 | char *escptr = NULL;
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59 | int cnt = 0;
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60 |
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61 | inptr = instr;
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62 |
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63 | // Count how many characters need escaping.
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64 | while (*inptr != '\0') {
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65 | escptr = toesc;
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66 | while (*escptr != '\0') {
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67 | if (*inptr == *escptr) {
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68 | // Found it, skip the rest.
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69 | cnt++;
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70 | break;
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71 | }
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72 | escptr++;
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73 | }
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74 | inptr++;
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75 | }
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76 | inptr = instr;
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77 |
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78 | retstr = (char *) malloc(strlen(inptr) + cnt + 1);
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79 | retptr = retstr;
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80 |
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81 | // Prepend specified characters with escape character.
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82 | while (*inptr != '\0') {
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83 | escptr = toesc;
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84 | while (*escptr != '\0') {
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85 | if (*inptr == *escptr) {
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86 | // Found it, prepend with the escape char
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87 | *retptr = escchr;
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88 | retptr++;
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89 | break;
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90 | }
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91 | escptr++;
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92 | }
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93 | *retptr = *inptr;
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94 | retptr++;
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95 | inptr++;
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96 | }
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97 | *retptr = '\0';
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98 |
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99 | return retstr;
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100 | }
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