#include "asterisk.h"
#include "asterisk/strings.h"
#include "asterisk/pbx.h"
Go to the source code of this file.
Functions | |
int | __ast_str_helper (struct ast_str **buf, ssize_t max_len, int append, const char *fmt, va_list ap) |
Core functionality of ast_str_(set|append)_va. | |
char * | __ast_str_helper2 (struct ast_str **buf, ssize_t maxlen, const char *src, size_t maxsrc, int append, int escapecommas) |
Definition in file strings.c.
int __ast_str_helper | ( | struct ast_str ** | buf, | |
ssize_t | max_len, | |||
int | append, | |||
const char * | fmt, | |||
va_list | ap | |||
) |
Core functionality of ast_str_(set|append)_va.
core handler for dynamic strings. This is not meant to be called directly, but rather through the various wrapper macros ast_str_set(...) ast_str_append(...) ast_str_set_va(...) ast_str_append_va(...)
Definition at line 55 of file strings.c.
References AST_DYNSTR_BUILD_FAILED, ast_str_make_space(), ast_verbose, and len().
Referenced by ast_str_set_va().
00058 { 00059 int res, need; 00060 int offset = (append && (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_USED : 0; 00061 va_list aq; 00062 00063 do { 00064 if (max_len < 0) { 00065 max_len = (*buf)->__AST_STR_LEN; /* don't exceed the allocated space */ 00066 } 00067 /* 00068 * Ask vsnprintf how much space we need. Remember that vsnprintf 00069 * does not count the final <code>'\0'</code> so we must add 1. 00070 */ 00071 va_copy(aq, ap); 00072 res = vsnprintf((*buf)->__AST_STR_STR + offset, (*buf)->__AST_STR_LEN - offset, fmt, aq); 00073 00074 need = res + offset + 1; 00075 /* 00076 * If there is not enough space and we are below the max length, 00077 * reallocate the buffer and return a message telling to retry. 00078 */ 00079 if (need > (*buf)->__AST_STR_LEN && (max_len == 0 || (*buf)->__AST_STR_LEN < max_len) ) { 00080 int len = (int)(*buf)->__AST_STR_LEN; 00081 if (max_len && max_len < need) { /* truncate as needed */ 00082 need = max_len; 00083 } else if (max_len == 0) { /* if unbounded, give more room for next time */ 00084 need += 16 + need / 4; 00085 } 00086 if (0) { /* debugging */ 00087 ast_verbose("extend from %d to %d\n", len, need); 00088 } 00089 if ( 00090 #if (defined(MALLOC_DEBUG) && !defined(STANDALONE)) 00091 _ast_str_make_space(buf, need, file, lineno, function) 00092 #else 00093 ast_str_make_space(buf, need) 00094 #endif 00095 ) { 00096 ast_verbose("failed to extend from %d to %d\n", len, need); 00097 va_end(aq); 00098 return AST_DYNSTR_BUILD_FAILED; 00099 } 00100 (*buf)->__AST_STR_STR[offset] = '\0'; /* Truncate the partial write. */ 00101 00102 /* Restart va_copy before calling vsnprintf() again. */ 00103 va_end(aq); 00104 continue; 00105 } 00106 va_end(aq); 00107 break; 00108 } while (1); 00109 /* update space used, keep in mind the truncation */ 00110 (*buf)->__AST_STR_USED = (res + offset > (*buf)->__AST_STR_LEN) ? (*buf)->__AST_STR_LEN - 1: res + offset; 00111 00112 return res; 00113 }
char* __ast_str_helper2 | ( | struct ast_str ** | buf, | |
ssize_t | maxlen, | |||
const char * | src, | |||
size_t | maxsrc, | |||
int | append, | |||
int | escapecommas | |||
) |
Definition at line 115 of file strings.c.
References ast_str::__AST_STR_LEN, and ast_str_make_space().
Referenced by ast_str_append_substr(), ast_str_append_va(), ast_str_set_escapecommas(), and ast_str_set_substr().
00116 { 00117 int dynamic = 0; 00118 char *ptr = append ? &((*buf)->__AST_STR_STR[(*buf)->__AST_STR_USED]) : (*buf)->__AST_STR_STR; 00119 00120 if (maxlen < 1) { 00121 if (maxlen == 0) { 00122 dynamic = 1; 00123 } 00124 maxlen = (*buf)->__AST_STR_LEN; 00125 } 00126 00127 while (*src && maxsrc && maxlen && (!escapecommas || (maxlen - 1))) { 00128 if (escapecommas && (*src == '\\' || *src == ',')) { 00129 *ptr++ = '\\'; 00130 maxlen--; 00131 (*buf)->__AST_STR_USED++; 00132 } 00133 *ptr++ = *src++; 00134 maxsrc--; 00135 maxlen--; 00136 (*buf)->__AST_STR_USED++; 00137 00138 if ((ptr >= (*buf)->__AST_STR_STR + (*buf)->__AST_STR_LEN - 3) || 00139 (dynamic && (!maxlen || (escapecommas && !(maxlen - 1))))) { 00140 char *oldbase = (*buf)->__AST_STR_STR; 00141 size_t old = (*buf)->__AST_STR_LEN; 00142 if (ast_str_make_space(buf, (*buf)->__AST_STR_LEN * 2)) { 00143 /* If the buffer can't be extended, end it. */ 00144 break; 00145 } 00146 /* What we extended the buffer by */ 00147 maxlen = old; 00148 00149 ptr += (*buf)->__AST_STR_STR - oldbase; 00150 } 00151 } 00152 if (__builtin_expect(!maxlen, 0)) { 00153 ptr--; 00154 } 00155 *ptr = '\0'; 00156 return (*buf)->__AST_STR_STR; 00157 }